I'd be cursing like a bloody sailor for every blown component. You just smile, giggle and move on to the next. What a guy! You have such a genuine positive aura around you :)
You are so patient and careful. I’d end up with a collection of screws and components with no idea what came from where. I enjoy your cheery disposition and quiet competence. Keep doing what you’re doing!
Hi Mark, I'm binging your videos at the moment and was interested to note you're 5 miles from RAF Cosford, I was stationed there 1979-80 doing electronics trade training, air radar to be precise and your videos remind me of my youth. Keep up the great channel.
@@JasperJanssen Peavey and audiophile do not belong in the same sentence. Peavey is decent, but not great, mid range gear at best. They are built to a fairly cheap price point, and for the money they aren't horrible.
This is the best repair channel on youtube. It's fun to watch and educational. Your fun and positive attitude towards even the most pesky of problems makes it such a pleasure to watch. Thank you Mark! excellent content all around. Sign me up as your newest subscriber : )
I have seen many kf these channels and I have to agree this one is one of the best it's very informative And for me brings back some memories as I used to repair electronics in my teens to mid 20s before I have up on it I self learned electronics and made a killing out of it back then mostly on VCRs and TVs
I agree with "chasin gain" and i cant improve on what he said. Im used to watching Dr.Carlsons Lab and his Norwegian friend who repairs amateur radios..... Mark, you are true class and a credit to your trade, and an excelent role model for any aspiring electronics apprentices who would like to lear the trade..... Your channel is excelent as is your ethos and working practice's which are exemplary....... Please keep up the great work.... Tony from Manchester (new subscriber 👍🏻🏆🙂).....
I completely agree with you. I can't put my finger on it but there's something so enjoyable about listening to him explain the details of the electronics and the fact that he even knows it in the first place is amazing
The problem with counterfeit semiconductors is a real pain. Having the curve tracer to check them under load is almost mandatory these days. Nothing worse than watching your extensive repair go bang. Great video.
The MOV mentioned was actually an NTC inrush limiting thermistor, wasn't it? And I assume you meant IGBT, Insulated Gate Bipolar Transistor. You're forgiven, for those who come up with acronyms likely never will be. 🫠
Mark, your positive attitude is infectious, and you know your stuff. Self tapping screws can be a liability in electronics because they can spit metal particles into the circuit and that can let out the magic blue smoke. SUBSCRIBED!
You and a few other TH-camrs like stezstix fix have given me the confidence to learn how to solder this year and hopefully be fixing audio stuff like you in a few years.
BACK IN THE DAY (1986) I repaired an old-school CS800 (which I still own and should probably not power on without checking all the capacitors). Between an electrical engineer at work and actually speaking to techs at Peavy in Meridian Mississippi to determine parts I could substitute in the 1st stage driver board - got it going again after replacing several big-ass output transistors. Built like a truck, really. All those big transistors mounted on huge heat sinks - and a chassis which was designed for the fan air to blow up to the top of the case, along the sink fins and out slots in the top sides of the case cover.
Your funny way of commenting on the repairs makes you very likeable. I really enjoy looking at your repairs. Please keep it up. I come from Germany and am a trained radio and television technician. Your English is easy to understand. Thank you and of course subscribed. Kind regards, Rolf
That must be a very valuable amp; to have technician-repaired not once, but twice! Back thirty years ago, when I was a young dumb techie, they used to yell at us if we'd spend more than a few minutes on each board. If the board was so far gone as to char the mask or burn the traces, in the rubbish bin it went. Awesome repair; I see so few with this kind of skill level any more. Subscribed!😁
Professional power amps can easily cost over 1000€ also as someone else mentioned if you have a stack of those you cannot just swap one with someone "similar". The amp was set in "parallel" so my guess is that they have at least a second identical amp which means that if they don't fix it they have to buy at least 2 new amps. Most of the time they replace all amps at the same time in a setup which would easily cost them a few thousand.
Great job! At 4000w it’s more a heater than an amplifier! I’m a retired technician still doing repairs at home. I have to say It’s nice to see how much fun you have doing these diagnostics and repairs. Over the years i have seen too many unhappy technicians. lol The curve tracer is amazing. Didn’t have access to that in my time or maybe my bosses where too cheap! 😂
Lol, I think your bosses were too cheap to get you a curve tracer. They've been around since the vacuum tube era. Edit: I believe Tektronix invented them sometime in the '50s
@@davelowets they didn’t like troubleshooting, all they wanted was to change parts quickly so they can charge the repair under warranty. Sometimes parts burn because of a problem eslewhere but they allowed no time to find that out. As long as the unit was back in service... the where dirty cheap! I worked for them only for a couple of years. I loved doing troubleshooting though. Then my professionnal carreer made a turn. I still troubleshoot and repair old hi-fi systems including jukeboxes.
I see many a HP instrument that I have used in the past in troubleshooting. You take me back to things I was doing using SMT devices. Where I worked, burned boards were required scrapped. Could not sell. Lots of memories I am reminded of. Thanks for the video.
Is there a more jolly and joyful guy in the world, I doubt it. He reminds me of my electrical engineering lecturer, (pun incoming) he was never phased, and charged us with a capacity for learning.
Hi sir im from the Philippines ... I thank you for watching your videos ... Electronics troubleshooting God blessed with your family circle ⭕🙏😇 STAYSAFE ALWAYS ❤️🙏😇
A Jedi power to make screws disappear? Just put them in one of my parts trays. Works every time! Love your work ethic Mark. You’ve earned a place on my panel of TH-cam mentors.
I work on old point to point wired guitar amps and PA amps, this video reminds me of why i only work on stone age tube amps, lol. SO much simpler and easier to trouble shoot., great video! Thanks for the upload!
@@davelowets That is true, some are a nightmare to work on. Some of the "newer" amps using turret boards have tendency to hide components under the board, that's never fun, lol.
@@jackallen6261 I've got a pair of old valve amps in my loft from my dad, struggling to find anyone in my area who wants to refurb them, I remember them having an amazingly rich sound and they also look really cool when they are working with the glow.
Another epic job. There's always so much jeopardy where large power amps are concerned. Almost as bad as doing UPS power supplies. That curve tracer is worth it's weight in gold these days with all the dodgy components flying around. Another great video.
Just love watching mark work away ! Reminds me of my time as industrial electronics engineer in the 80s! Most satisfying part of my life!! Thanks for the memories Mark😊😊
Your confidence in your repair is amazing, to put that all back together with all the screws before testing. I would be trying to power it up with all the parts still all over the bench.
I literally just stumbled on your channel, wow you make work look like fun, you have a new fan, you seem to have every tool you could possibly need,. THANK YOU FOR FILMING ALL YOUR WORK,.
Mark I wish I had 1000the the knowledge you have and 100the the equipment. It's so nice watching a skilled tradesman at work. Thank you for sharing your expertise with us. Love the channel and the videos. One last thing ,you must have the patience of a saint to fix stuff so complicated and time consuming, I would have kicked this thing into touch, after the first 5 minutes.
I’m glad I discovered your YT channel Mark. There’s one tool I use a lot which I think you desperately need is a micro pencil Dremel tool. They’re super cheap on Ali and come with a dozen fine bits (use USB-C charger) put away that knife and flat head screw driver and remove solder mask and burned spots with ease.
Sono un tecnico e ti dico che è una meraviglia vederti riparare con tanta professionalità. Veramente bellissima riparazione e spiegazione di tutti i passaggi. Dio ti benedica Un saluto dall'Italia 🇮🇹
In nearly every comment, i see "new subscriber" mentioned..... yes this channel is prime for a million subscribers..... and whilst Dr. Carlsons lab is also very professional it can be a little formal, wethers. Marks channel is very informal, like one qas in the pub with your friends.... vwry relaxing friendly channel 👍🏻🏆 Mark will go far and top the million subscribwr mark before end of 2024... ive seen other channels just explode up like the P.c channels, and the HiFi revue channels just shoot up like Zeos to mention 1 of many excelent channels likw this one is.... 🙂👍🏻💥
Hi mark. Hello from Dublin. I used to work as an av tech for 15 years. So I totally understand your wows. Love the channel and your very good at what you do.
Yours is now my favourite TH-cam channel and I think I've watched all your videos at least twice, so keep them coming.! You did a great job on this amp. Finding all those faults was top-notch.
I hope you earned plenty from TH-cam views, because I can’t imagine you could charge enough to justify the time spent on this repair. Beautiful work. Very educational. But you could bin that old amp and replace it for less than the cost of repairing it.
I was learn great details about electronic repair.Thank you for these amazing videos I was watched so much repair videos last 4-5 years on TH-cam .I was find this channel yesterday.(Sure I was be member) TH-cam don't show your channel never while yesterday .I think youtube's advice channel algoritmys changed and I sure your channel's subscribers increase so you must continue to these amazing videos *Sorry for my bad english but I hope understand me
As a sound engineer I always joked that if I was stranded on a desert island and the natives would eat me if the PA went out I'd have Peavey amps! These were built to survive bar bands connecting the main speakers to the left channel & 7 monitor wedges to the right!
Well done Mark. Amazing job again. I really love your repair videos, keep going. Ur a very nice person. Just one thing: at 26:50 the other IGBT (Q132) looks like it is not soldered properly. Especially the collector leg. It can be a cold soldering joint. I don't like the emitter soldering either, but I know the device is working properly. 🙂
I guess the main goal of these is repair. But I really liked the ‘post-mortem’/investigation parts where you try to conjecture and figure out what caused the malfunction 👌🏼
Good diagnostics,all i would ad is use a plastic spreader for the heat sink compound,just so it's evenly spread,you put enough on & it would probably spread out once heat sink is tightened. Have successfully repaired the simple peavey PV2600 ranges on many occasions,some of those blow bit time,loads to replace as well as board burn scraping,, key is not to rush & buy genuine parts,as you say ,ebay has a lot of fake parts,some are derated & almost impossible to test properly,i used a home made transistor matcher that you could load the power output trannies to there max,before they were put back onto the pcb. The thing with power amps is test at full load,with freq gen, for an hour or so,with a resistor/oil load on the output channels ,as this is the only way to make sure all is ok. 4000 watt amps will need some hefty metal clad lod resistors in oil, as lots of heat will be generated. Im retired now, had a great ,enjoyable ,varied 45 year + career as an electronics engineer.. Cheers.
Outstanding and Brilliant are not good enough wording for your skills and talent! Love your positive, quirky outlook on challenging problems that you seem to solve with ease and poise. WOW!!
As a musician, I was quite fond of Peavey....as a repair tech though, I dispise their products. I had one of their full tube Guitar amps (a classic 50/50) for repair over a year ago and the build/design quality and repairability factor wasn't what you'd expect. Mark, you are a better man than I! Didn't hear you utter one oath or subtle threat stating you'd hoy it out the window. Just found this channel randomly and am a tad irritated I had not found it sooner 🤪 Add one to your subscriber list mate and thanks for the upload!
I've had success at fixing the older stuff.......the SMD gear still makes me nervous. I appreciate your jovial attitude in getting through a job such as this.
Hola Mark, muchas gracias por tus videos, la semana anterior repare uno exactamente igual, soy de Tegucigalpa, Honduras, no tengo tantos equipos de prueba como tu, pero si el conocimiento. Que bueno que encontré este canal, me gusta la forma en que trabajas, me hace querer mejorar aun más, saludos!!!!
I have been watching your videos and enjoying them so much. You make it look so easy and it definitely isn't easy. But thanks to you, I got motivated to fix the door lock on my Ford F-150, and I actually succeeded. Thanks and keep up the great work.
Absolutely fantastic video Mark you're so patient and relaxed that was definitely the unmistakable sound of a Chinook would have been tempted to poke my head out
this peavey amp is nicely built, retired after 40 years, it sure would of been nice to work with gents like yourself mate ....thank-you for being you ..ALLAHS, blessings to ya MATE ..YOUR TEAS READY !!
I think the main issue with the amp is simply that it was made by peavey! So called industry standard, we ridiculed them as they always went wrong, speakers the same...love the videos mark
I was an electronics tech for quite a few years, I wish I had half the gear that you have. Life would have been a little easier. Enjoy the vids. Cheers.
Did you end up replacing the damaged thermistors? Or were they fine? Very entertaining Mark. You really dig in and get into your repairs. I especially love the actual repairs on parts that are no longer available such as the motor and hinge assembly of that linear tracking turntable. Simply put you do amazingly detailed restorations.
Stumbled across your channel, and i am Safe to say i really like the content, I primarily work on IT equipment but i love seeing everything getting fixed
Got my electronics degree in 1985. Never used it. Love watching the process. I have 2 peavey cs 800 that have problems. I'll get to it someday. Enjoyed the video. Thanks
Back in 85', did you have to do thousand word essays on "equality in the workplace" and "change management"? I started a program a few years back that had us spending 80% of our time learning to be what THEY think a good manager is, rather than about electronics. Only a single 1 hour session a week in the lab, and the guy teaching clearly knew less about electronics than I already did, so I bailed. I'd do anything to go back 20 or 30 years and do a proper craft apprenticeship like my dad did.
@digitalradiohacker Im sure you still can "Digital".... in the uk we have "adult learning" classes and colleges, theres even "on line learning" where you can take the modules in your oqn time and pace, if you are working or a full time parent.... Im sure America has the same opertunities, or from wherever you live 🙂👍🏻..... give it a go ?
Worked on older 40kW Unholtz-Dickie shaker table audio amplifiers. Class B amp water cooled, intended for continues operation at that power. A little bigger then this baby. Unholtz-Dickie now makes 720KVA shaker table audio amplifiers. Now thats a beast.
As usual, great job explaining and performing a repair. And beautiful job of recording and editing the video. Yours are among the best repair videos on TH-cam. Thanks for the great work.
Actually..... its all so neat and tidy aswell.... that lathe he has, and the electronic microscope is worth alot of money, and im sure Mark has more than a Degree in electronic repairs.... Also, it shows that he has a lot of skill and experiance in this line of work.... a very rare commodity in todays world.....
You are great at what you do. I hope you are proud of what you can accomplish. I enjoy your videos very much, thanks for taking the time to show your work.
Hi and hello Mark, I came across your channel just today, you repaired the technics cassette deck and I have just watched this one and after this write up the alto TS310 plus many more... GREAT REPAIR IT IS NICE TO SEE SOME ONE WITH A BIT OF BRAINAGE FOR A CHANGE!!!!! and not just BLOODY CAPS.... But we do now and then forget mr CHARGED cap 😉
Hi Mark,You have got some magic in your fingers. I am a new subscriber, and I love what I see. I think you make many owners very happy with all the repairs you have done. Well...I gave you a big thumbs up and subscribed...Until next time. Sincerely, Bert from the Netherlands. ( Sorry if my English is not a good as yours. As a dutch bloke I am trying.)
Great job Mark! And an entertaining watch:) To your last words (they have a vibe of "famous last words" for me?! Hehe): That seems to be a very strange design decision from Peavey to put those slim -botches- isolating sheets onto the top casing. DJ equipment will see vast changes of temperature differences (transportation, out of the car into the wild, then back to the gig-location with high air humidity). These plastic (or worse?) sheets will inevitably draw humidity. Well, at least it will be "cooked" away:) Anyways ... not much of a concern as we all know that there are plenty of modes your equipment can (and will) fail you at the worst time possible. Thanks for the video and showing this off. I am a "MOUNT THAT RESISTOR IN CORRECT READABLE ORIENTATION"-fanatics girl (our specialist profession trainer at the time would have broken our fingers because of this blasphemy, hehe) ... so: subscribed and greetings from Germany!:)
26:23 I was a bit worried that the middle pin on ic Q132 on the right hadn't been soldered. But I'm sure that Mark would have spotted it but didn't film it. And yes the upside down resistor did trigger my OCD but I got over it eventually. C404, the missing capacitor mystery. I spotted that it was actually in place at the beginning of the video. Weird how it vanished. Probably under the workbench. (You'll find it one day... 😂) Great job as always Mark! You make it look so easy.👍
I heard a story that Peavy are so well made. Some early amps were recovered from the Titanic and after drying them out they were ready just in time for the next Manowar concert.
I am nothing more than an amateur, and (to see someone take everything in their stride with a smile), is almost 'magical'. I have had several successes - but lots of tough-dog failures too! As I watched you work on the Peavey, I couldn't help thinking that (because all of the damage was not localised), I strongly suspected a Power Surge. greetings fro Australia.
I consider myself an amateur as well although over the last year and a half I've gotten better, at least I think I have. I now have a lot more successes than failures. I will say the thing that I learned that's made the process better is if I'm having a tough time with something, either figuring out how it works or how it goes back together or for other reasons, step away for a moment. Take a break and reassess the situation, go get a cup of coffee or have a cigarette if you smoke. I'll take and leave a repair overnight and then come back first thing in the morning or the next evening and go at it again. I noticed by doing this it is really allowed me to take something I probably would have thrown in the trash or gave up on and take it to a point of completion. Another thing that I've done that has really helped is breakdown repairs in stages. If I used to take apart a tape deck and the mechanism needed new belts and it also had a blown motor and the Dolby board needed to be gone through, I would try to do it all at once and ultimately end up frustrating myself and kind of hit a wall. Now I take and replace the motor and go through the mechanism. Then I'll take a break or leave it overnight as I've said and then come back the next day and go through the Dolby. Anyway just sharing my experiences and if you enjoy doing it keep it up, I do it as a hobby, I've always enjoyed taking things apart and figuring out how they work, and I'm sure most people that do this do as well.
Mark, wouldn't most shops just tell the owner that he now has an amplifier for spare parts if he can find a good Peavey to use them on? I don't know how you do it. If there are micro-archaeologists in 10,000 years they are going to marvel at your workmanship! You are probably in a class all of your own! 👽🛸
![1870s Circular Sock Knitting Machine [Restoration]](http://i.ytimg.com/vi/rAFlLEoFilM/mqdefault.jpg)
I'd be cursing like a bloody sailor for every blown component. You just smile, giggle and move on to the next. What a guy! You have such a genuine positive aura around you :)
LOL!!!
Every blown component is more money for him.... 😁
When you start cursing is when you know you've been doing it too long - lol -.
Peavey was never the best-designed solid state amplifier on the market. Probably could do the same thing with four 4CX1000 tubes in the PA.
I assume he's earning money replacing components but perhaps it's an ocd 😂
The Bob Ross among electronics technicians, love it!!!
i thought exactly the same 😁
As thw 'tween crowd would say, "TOTES Adorbs!" :)
...we will give this capacitor a little friend...
Happy little transistors.
In my humble opinion, these are the only "shorts" young people should be watching on TH-cam
As a sysadmin, I find it particularly humuours that capacitor 404 has gone missing.
Great content.
Whatever floats your boat. You need to get out more, seriously.
@@mariemccann5895 With a grumpy comment like that I'm inclined to believe it's You who need to get out more, you know - maybe find some joy? Cheers!
LOL. I can relate to that! Would be great if you could say that resistor 400 was not soldered correctly :)
Thats my people, right here. 404 Poof
I'm so using that joke
You are so patient and careful. I’d end up with a collection of screws and components with no idea what came from where. I enjoy your cheery disposition and quiet competence. Keep doing what you’re doing!
I tried fixing a PS2 once, it ended up as a cardboard box of bits in my loft, now its landfill somewhere.
Hi Mark, I'm binging your videos at the moment and was interested to note you're 5 miles from RAF Cosford, I was stationed there 1979-80 doing electronics trade training, air radar to be precise and your videos remind me of my youth. Keep up the great channel.
I have no idea what Mark is doing, but I do enjoy his narration and the personality that is revealed.
When you removed the board and started probing around, I was waiting for those caps to let you know they’re not discharged, I was not disappointed 🤣🤣🤣
Proper design should be self discharging.
@@Katchi_probably the Audiophile in them that doesn’t like discharge resistors.
@@JasperJanssen Peavey and audiophile do not belong in the same sentence. Peavey is decent, but not great, mid range gear at best. They are built to a fairly cheap price point, and for the money they aren't horrible.
@@mxslick50Peavey are the Jaguar of amplifiers: built down to a price…
Audiophile doesnt belong in any sentence. Peavey does though, but this one seems to be badly engineered
Just when you think you have seen the best technicians in the world, another one shows up in a different part of the world. Great work, very talented.
This is the best repair channel on youtube. It's fun to watch and educational. Your fun and positive attitude towards even the most pesky of problems makes it such a pleasure to watch. Thank you Mark! excellent content all around. Sign me up as your newest subscriber : )
what you said...👍👍
I have seen many kf these channels and I have to agree this one is one of the best it's very informative
And for me brings back some memories as I used to repair electronics in my teens to mid 20s before I have up on it I self learned electronics and made a killing out of it back then mostly on VCRs and TVs
I agree with "chasin gain" and i cant improve on what he said. Im used to watching Dr.Carlsons Lab and his Norwegian friend who repairs amateur radios..... Mark, you are true class and a credit to your trade, and an excelent role model for any aspiring electronics apprentices who would like to lear the trade.....
Your channel is excelent as is your ethos and working practice's which are exemplary.......
Please keep up the great work....
Tony from Manchester (new subscriber 👍🏻🏆🙂).....
I completely agree with you. I can't put my finger on it but there's something so enjoyable about listening to him explain the details of the electronics and the fact that he even knows it in the first place is amazing
Just can't stop watching the circuit surgeon at work.
The problem with counterfeit semiconductors is a real pain. Having the curve tracer to check them under load is almost mandatory these days. Nothing worse than watching your extensive repair go bang. Great video.
I was freaking out at the end! The MOV still had a good chunk missing and the center leg of the neighbor IBJT was missing most of its solder.
Yep, I was waiting for it to..
The MOV mentioned was actually an NTC inrush limiting thermistor, wasn't it? And I assume you meant IGBT, Insulated Gate Bipolar Transistor. You're forgiven, for those who come up with acronyms likely never will be. 🫠
Also seems the paper next to the fan for airflow over the heatsink didn't went back in :-/
C124 and C125 were also missing. It looked like they had been removed or never installed. Would have been good to investigate.
brilliant job, pure patience, a great example in how to logically deal with multiple areas of damage and how to deal with board and pad damage
Between you and Mr Carlson the world of electronics is made to look a whole lot easier . Great work Mark, wish you lived closer.
Mark, your positive attitude is infectious, and you know your stuff. Self tapping screws can be a liability in electronics because they can spit metal particles into the circuit and that can let out the magic blue smoke. SUBSCRIBED!
You and a few other TH-camrs like stezstix fix have given me the confidence to learn how to solder this year and hopefully be fixing audio stuff like you in a few years.
Thanks for the video Mark. My friend, a HiFi audio amplifier designer and engineer really enjoyed it too.
I love this guys demeanor. Just so easy going and happy. 90% of us would be cussing and throwing a kaniption fit
Props on spelling "demeanor". No props for "conniption"...
@@yeahright9014 sorry been studying german and messing up spelling even simple words lately. Its the aspburgers....
Me too! 😂
BACK IN THE DAY (1986) I repaired an old-school CS800 (which I still own and should probably not power on without checking all the capacitors). Between an electrical engineer at work and actually speaking to techs at Peavy in Meridian Mississippi to determine parts I could substitute in the 1st stage driver board - got it going again after replacing several big-ass output transistors. Built like a truck, really. All those big transistors mounted on huge heat sinks - and a chassis which was designed for the fan air to blow up to the top of the case, along the sink fins and out slots in the top sides of the case cover.
I'm sat in my kitchen in France watching this repair, I can say it is very therapeutic
Your funny way of commenting on the repairs makes you very likeable. I really enjoy looking at your repairs. Please keep it up. I come from Germany and am a trained radio and television technician. Your English is easy to understand. Thank you and of course subscribed. Kind regards, Rolf
That must be a very valuable amp; to have technician-repaired not once, but twice! Back thirty years ago, when I was a young dumb techie, they used to yell at us if we'd spend more than a few minutes on each board. If the board was so far gone as to char the mask or burn the traces, in the rubbish bin it went. Awesome repair; I see so few with this kind of skill level any more. Subscribed!😁
They are pretty expensive, but probably one of a matched set which makes it even more valuable to whoever owns it.
Hi mate how can I get access to that schematic
Professional power amps can easily cost over 1000€ also as someone else mentioned if you have a stack of those you cannot just swap one with someone "similar".
The amp was set in "parallel" so my guess is that they have at least a second identical amp which means that if they don't fix it they have to buy at least 2 new amps. Most of the time they replace all amps at the same time in a setup which would easily cost them a few thousand.
That toroid transformer alone is many hundreds of bucks.it’s huge.
Not as expensive as a proper pro amp, crown for example...
Great job! At 4000w it’s more a heater than an amplifier! I’m a retired technician still doing repairs at home. I have to say It’s nice to see how much fun you have doing these diagnostics and repairs. Over the years i have seen too many unhappy technicians. lol The curve tracer is amazing. Didn’t have access to that in my time or maybe my bosses where too cheap! 😂
Switching amps of this size don't create much heat at all. In my opinion, they don't sound all that great either. 🤷🏻
@@davelowets i was under the impression that it was a parallel push-pull configuration.
@@Wurlyscope It's a rail switcher, that bumps up the rail voltage to the output stage according to the level of the input signal. Class H
Lol, I think your bosses were too cheap to get you a curve tracer. They've been around since the vacuum tube era.
Edit: I believe Tektronix invented them sometime in the '50s
@@davelowets they didn’t like troubleshooting, all they wanted was to change parts quickly so they can charge the repair under warranty. Sometimes parts burn because of a problem eslewhere but they allowed no time to find that out. As long as the unit was back in service... the where dirty cheap! I worked for them only for a couple of years. I loved doing troubleshooting though. Then my professionnal carreer made a turn. I still troubleshoot and repair old hi-fi systems including jukeboxes.
I just found your channel. I have been in the rf business for 40 years. Its a treat to find a young man at you repair caliber. Excellent video. Thanks
This is my new favorite channel. I absolutely love watching him work ! Positivity is contagious!
I see many a HP instrument that I have used in the past in troubleshooting. You take me back to things I was doing using SMT devices. Where I worked, burned boards were required scrapped. Could not sell. Lots of memories I am reminded of. Thanks for the video.
Is there a more jolly and joyful guy in the world, I doubt it. He reminds me of my electrical engineering lecturer, (pun incoming) he was never phased, and charged us with a capacity for learning.
Hi sir im from the Philippines ... I thank you for watching your videos ... Electronics troubleshooting God blessed with your family circle ⭕🙏😇 STAYSAFE ALWAYS ❤️🙏😇
A Jedi power to make screws disappear? Just put them in one of my parts trays. Works every time!
Love your work ethic Mark. You’ve earned a place on my panel of TH-cam mentors.
That toroidal transformer is an absolute beast
I work on old point to point wired guitar amps and PA amps, this video reminds me of why i only work on stone age tube amps, lol. SO much simpler and easier to trouble shoot., great video! Thanks for the upload!
You'd be surprised... Some of those old rats nests are even more frustrating than the newer stuff...
Don't sell yourself short.
@@davelowets That is true, some are a nightmare to work on. Some of the "newer" amps using turret boards have tendency to hide components under the board, that's never fun, lol.
@@jackallen6261 I've got a pair of old valve amps in my loft from my dad, struggling to find anyone in my area who wants to refurb them, I remember them having an amazingly rich sound and they also look really cool when they are working with the glow.
@@slacko1971 Oh how cool! Yeah, its getting harder and harder to find people who work on tube stuff these days.
Another epic job. There's always so much jeopardy where large power amps are concerned. Almost as bad as doing UPS power supplies. That curve tracer is worth it's weight in gold these days with all the dodgy components flying around. Another great video.
Just love watching mark work away ! Reminds me of my time as industrial electronics engineer in the 80s! Most satisfying part of my life!! Thanks for the memories Mark😊😊
Your confidence in your repair is amazing, to put that all back together with all the screws before testing. I would be trying to power it up with all the parts still all over the bench.
I literally just stumbled on your channel, wow you make work look like fun, you have a new fan, you seem to have every tool you could possibly need,. THANK YOU FOR FILMING ALL YOUR WORK,.
Mark I wish I had 1000the the knowledge you have and 100the the equipment. It's so nice watching a skilled tradesman at work. Thank you for sharing your expertise with us. Love the channel and the videos. One last thing ,you must have the patience of a saint to fix stuff so complicated and time consuming, I would have kicked this thing into touch, after the first 5 minutes.
Nice bench. Nice to see someone else is into it as deep as I am. Also glad to see someone else into repairing electronics.
Me too here in my country.
I’m glad I discovered your YT channel Mark. There’s one tool I use a lot which I think you desperately need is a micro pencil Dremel tool. They’re super cheap on Ali and come with a dozen fine bits (use USB-C charger) put away that knife and flat head screw driver and remove solder mask and burned spots with ease.
Sono un tecnico e ti dico che è una meraviglia vederti riparare con tanta professionalità.
Veramente bellissima riparazione e spiegazione di tutti i passaggi.
Dio ti benedica
Un saluto dall'Italia 🇮🇹
I love how much you smile. It's genuinely enjoyable watching someone who is deeply joyful about what they're working on.
Also subbed. You deserve a lot more subscribers...I have a feeling you're going to blow up soon. You deserve a large audience. You're a great teacher.
In nearly every comment, i see "new subscriber" mentioned..... yes this channel is prime for a million subscribers..... and whilst Dr. Carlsons lab is also very professional it can be a little formal, wethers. Marks channel is very informal, like one qas in the pub with your friends.... vwry relaxing friendly channel 👍🏻🏆 Mark will go far and top the million subscribwr mark before end of 2024... ive seen other channels just explode up like the P.c channels, and the HiFi revue channels just shoot up like Zeos to mention 1 of many excelent channels likw this one is.... 🙂👍🏻💥
Hi mark. Hello from Dublin. I used to work as an av tech for 15 years. So I totally understand your wows. Love the channel and your very good at what you do.
The man is positively cheerful continuously!
Yours is now my favourite TH-cam channel and I think I've watched all your videos at least twice, so keep them coming.! You did a great job on this amp. Finding all those faults was top-notch.
I hope you earned plenty from TH-cam views, because I can’t imagine you could charge enough to justify the time spent on this repair. Beautiful work. Very educational. But you could bin that old amp and replace it for less than the cost of repairing it.
I was learn great details about electronic repair.Thank you for these amazing videos
I was watched so much repair videos last 4-5 years on TH-cam .I was find this channel yesterday.(Sure I was be member)
TH-cam don't show your channel never while yesterday .I think youtube's advice channel algoritmys changed and I sure your channel's subscribers increase so you must continue to these amazing videos
*Sorry for my bad english but I hope understand me
What a nice lab you have. All the equipment you need, on hand, to make work less stressful.
As always I could watch you every day Mark! Fantastic job on these!
As a sound engineer I always joked that if I was stranded on a desert island and the natives would eat me if the PA went out I'd have Peavey amps! These were built to survive bar bands connecting the main speakers to the left channel & 7 monitor wedges to the right!
Well done Mark. Amazing job again. I really love your repair videos, keep going. Ur a very nice person.
Just one thing: at 26:50 the other IGBT (Q132) looks like it is not soldered properly. Especially the collector leg. It can be a cold soldering joint. I don't like the emitter soldering either, but I know the device is working properly. 🙂
I'm with you on this one. I kept saying "Solder the collector" as I was watching the video.
I guess the main goal of these is repair. But I really liked the ‘post-mortem’/investigation parts where you try to conjecture and figure out what caused the malfunction 👌🏼
Good diagnostics,all i would ad is use a plastic spreader for the heat sink compound,just so it's evenly spread,you put enough on & it would probably spread out once heat sink is tightened. Have successfully repaired the simple peavey PV2600 ranges on many occasions,some of those blow bit time,loads to replace as well as board burn scraping,, key is not to rush & buy genuine parts,as you say ,ebay has a lot of fake parts,some are derated & almost impossible to test properly,i used a home made transistor matcher that you could load the power output trannies to there max,before they were put back onto the pcb. The thing with power amps is test at full load,with freq gen, for an hour or so,with a resistor/oil load on the output channels ,as this is the only way to make sure all is ok. 4000 watt amps will need some hefty metal clad lod resistors in oil, as lots of heat will be generated. Im retired now, had a great ,enjoyable ,varied 45 year + career as an electronics engineer.. Cheers.
Outstanding and Brilliant are not good enough wording for your skills and talent! Love your positive, quirky outlook on challenging problems that you seem to solve with ease and poise. WOW!!
As a musician, I was quite fond of Peavey....as a repair tech though, I dispise their products. I had one of their full tube Guitar amps (a classic 50/50) for repair over a year ago and the build/design quality and repairability factor wasn't what you'd expect.
Mark, you are a better man than I! Didn't hear you utter one oath or subtle threat stating you'd hoy it out the window.
Just found this channel randomly and am a tad irritated I had not found it sooner 🤪
Add one to your subscriber list mate and thanks for the upload!
I've had success at fixing the older stuff.......the SMD gear still makes me nervous. I appreciate your jovial attitude in getting through a job such as this.
Hola Mark, muchas gracias por tus videos, la semana anterior repare uno exactamente igual, soy de Tegucigalpa, Honduras, no tengo tantos equipos de prueba como tu, pero si el conocimiento. Que bueno que encontré este canal, me gusta la forma en que trabajas, me hace querer mejorar aun más, saludos!!!!
Love that enthusiasm and fun that you are having doing these repairs. I wish I could learn that
Watching a lot of your old videos now. This one made me yell at the screen, "Don't bend it, Mark!"
I have been watching your videos and enjoying them so much. You make it look so easy and it definitely isn't easy. But thanks to you, I got motivated to fix the door lock on my Ford F-150, and I actually succeeded. Thanks and keep up the great work.
Those little glass desert pots make great parts holders, I keep the plastic lids if they come with them for work-in-progress storage 😊
Love your videos Mark! You are a true craftsman. Thanks for sharing your knowledge. Awesome shop you have.
Absolutely fantastic video Mark you're so patient and relaxed that was definitely the unmistakable sound of a Chinook would have been tempted to poke my head out
Excellent master technician with an Excellent attitude. If I ever get a meltdown on some of my legacy equipment, he has my business without question.
this peavey amp is nicely built, retired after 40 years, it sure would of been nice to work with gents like yourself mate ....thank-you for being you ..ALLAHS, blessings to ya MATE ..YOUR TEAS READY !!
I think the main issue with the amp is simply that it was made by peavey! So called industry standard, we ridiculed them as they always went wrong, speakers the same...love the videos mark
you have a nice set of tools and your work station is very neat and tidy, we all admire that very much , very nice and professional !!
I just love the sight of a large toroidal transformer. I especially appreciate it now that it's slowly disappearing forever.
I was an electronics tech for quite a few years, I wish I had half the gear that you have. Life would have been a little easier. Enjoy the vids. Cheers.
PRETTY PRETTY PRETTY!!! And the curve tracer demonstration was a real treat! YESSSIREEE
Should have that on Antiques Roadshow! Quality work mate.
Did you end up replacing the damaged thermistors? Or were they fine? Very entertaining Mark. You really dig in and get into your repairs. I especially love the actual repairs on parts that are no longer available such as the motor and hinge assembly of that linear tracking turntable. Simply put you do amazingly detailed restorations.
I haven’t got a clue what you just did, but it sure was fun to watch!
Stumbled across your channel, and i am Safe to say i really like the content,
I primarily work on IT equipment but i love seeing everything getting fixed
Got my electronics degree in 1985. Never used it. Love watching the process. I have 2 peavey cs 800 that have problems. I'll get to it someday. Enjoyed the video. Thanks
Back in 85', did you have to do thousand word essays on "equality in the workplace" and "change management"?
I started a program a few years back that had us spending 80% of our time learning to be what THEY think a good manager is, rather than about electronics. Only a single 1 hour session a week in the lab, and the guy teaching clearly knew less about electronics than I already did, so I bailed.
I'd do anything to go back 20 or 30 years and do a proper craft apprenticeship like my dad did.
@digitalradiohacker
Im sure you still can "Digital".... in the uk we have "adult learning" classes and colleges, theres even "on line learning" where you can take the modules in your oqn time and pace, if you are working or a full time parent....
Im sure America has the same opertunities, or from wherever you live 🙂👍🏻..... give it a go ?
Worked on older 40kW Unholtz-Dickie shaker table audio amplifiers. Class B amp water cooled, intended for continues operation at that power.
A little bigger then this baby.
Unholtz-Dickie now makes 720KVA shaker table audio amplifiers. Now thats a beast.
As usual, great job explaining and performing a repair. And beautiful job of recording and editing the video. Yours are among the best repair videos on TH-cam. Thanks for the great work.
Absolute Genius. A joy to listen to your banter. You made this so much fun to learn about.
Hallo Mark,Du bist so ein freundlicher Mensch! Es ist erstaunlich,über welch ein Wissen Du verfügst.Absolut amazing !!!!!!!!!👍👍👍👍👍👍👍👍
Epic job Mark. Really enjoyed the fault finding. Top job
Just found your channel. Absolute delight to watch and great work! That curve tracer is seriously cool.
Joy to watch you working on it!
You sure know your stuff and being very handy on top of it makes the winning combo!
Magnum repair! 100 points awarded. Cheers from So.CA.USA 3rd house on the right.
Mark, you have one of the best service bench. great going.
Actually..... its all so neat and tidy aswell.... that lathe he has, and the electronic microscope is worth alot of money, and im sure Mark has more than a Degree in electronic repairs....
Also, it shows that he has a lot of skill and experiance in this line of work.... a very rare commodity in todays world.....
i love a 'mend it mark' repair video,very nice job Mark..well done to you.
Its also nice to watch a 2 hour video with some chat inside..... as ive watched on other chanels..... 🙂👍🏻
You are great at what you do. I hope you are proud of what you can accomplish. I enjoy your videos very much, thanks for taking the time to show your work.
Hi and hello Mark, I came across your channel just today, you repaired the technics cassette deck and I have just watched this one and after this write up the alto TS310 plus many more... GREAT REPAIR IT IS NICE TO SEE SOME ONE WITH A BIT OF BRAINAGE FOR A CHANGE!!!!! and not just BLOODY CAPS.... But we do now and then forget mr CHARGED cap 😉
Great repair again Mark..I really admire your skills
Hi Mark,You have got some magic in your fingers. I am a new subscriber, and I love what I see. I think you make many owners very happy with all the repairs you have done. Well...I gave you a big thumbs up and subscribed...Until next time. Sincerely, Bert from the Netherlands. ( Sorry if my English is not a good as yours. As a dutch bloke I am trying.)
Great job Mark! And an entertaining watch:)
To your last words (they have a vibe of "famous last words" for me?! Hehe): That seems to be a very strange design decision from Peavey to put those slim -botches- isolating sheets onto the top casing. DJ equipment will see vast changes of temperature differences (transportation, out of the car into the wild, then back to the gig-location with high air humidity). These plastic (or worse?) sheets will inevitably draw humidity. Well, at least it will be "cooked" away:) Anyways ... not much of a concern as we all know that there are plenty of modes your equipment can (and will) fail you at the worst time possible. Thanks for the video and showing this off. I am a "MOUNT THAT RESISTOR IN CORRECT READABLE ORIENTATION"-fanatics girl (our specialist profession trainer at the time would have broken our fingers because of this blasphemy, hehe) ... so: subscribed and greetings from Germany!:)
Everyone KNOWS that if you put them upside down, the electrons will fall out.
Legend! Great repair! I wish there were some people who did what you do in my area of the states! Cheers!
Very informative. A repair that I would not have attempted but you are so brave!
26:23 I was a bit worried that the middle pin on ic Q132 on the right hadn't been soldered. But I'm sure that Mark would have spotted it but didn't film it. And yes the upside down resistor did trigger my OCD but I got over it eventually. C404, the missing capacitor mystery. I spotted that it was actually in place at the beginning of the video. Weird how it vanished. Probably under the workbench. (You'll find it one day... 😂) Great job as always Mark! You make it look so easy.👍
Just discovered your channel 👍
Certainly the jolliest repairman out there.
I heard a story that Peavy are so well made. Some early amps were recovered from the Titanic and after drying them out they were ready just in time for the next Manowar concert.
Absolutely brilliant Mark I've learnt so much watching this video, you are an inspiration keep it up.
I am nothing more than an amateur, and (to see someone take everything in their stride with a smile), is almost 'magical'. I have had several successes - but lots of tough-dog failures too! As I watched you work on the Peavey, I couldn't help thinking that (because all of the damage was not localised), I strongly suspected a Power Surge. greetings fro Australia.
I consider myself an amateur as well although over the last year and a half I've gotten better, at least I think I have. I now have a lot more successes than failures.
I will say the thing that I learned that's made the process better is if I'm having a tough time with something, either figuring out how it works or how it goes back together or for other reasons, step away for a moment. Take a break and reassess the situation, go get a cup of coffee or have a cigarette if you smoke. I'll take and leave a repair overnight and then come back first thing in the morning or the next evening and go at it again.
I noticed by doing this it is really allowed me to take something I probably would have thrown in the trash or gave up on and take it to a point of completion.
Another thing that I've done that has really helped is breakdown repairs in stages. If I used to take apart a tape deck and the mechanism needed new belts and it also had a blown motor and the Dolby board needed to be gone through, I would try to do it all at once and ultimately end up frustrating myself and kind of hit a wall. Now I take and replace the motor and go through the mechanism. Then I'll take a break or leave it overnight as I've said and then come back the next day and go through the Dolby.
Anyway just sharing my experiences and if you enjoy doing it keep it up, I do it as a hobby, I've always enjoyed taking things apart and figuring out how they work, and I'm sure most people that do this do as well.
Great to hear your thoughts, and I agree with you! Greetings from Sydney
Mark, wouldn't most shops just tell the owner that he now has an amplifier for spare parts if he can find a good Peavey to use them on? I don't know how you do it. If there are micro-archaeologists in 10,000 years they are going to marvel at your workmanship! You are probably in a class all of your own! 👽🛸
This is a real find! So glad to have found your channel.
Very nice job and fun to see. I never worked on such an audio powerhouse. Gave you the thumb up.
You can use UV solder mask to repair pcbs and kerosine oil to remove Silicon compound. Great job on amp 👍👍