I found Mark whilst searching for some info of how to repair my Sony RCD-W100 CD player. His exploits in the world of repairing all sorts of audio equipment really is quite captivating. Never have I seen such electronic expertise demonstrated in such a charismatic way. Just amazing!! Thank you Mark.
I recently restored a Dynacord GIGANT amplifier from 1969. It was a total nightmare. 79 capacitors, several resistors and transistors, new tubes, some bad pots, and so much more. After three months it's finally restored to all it's glory.
I had the crappiest day I've had in a long time at work today. Just binged about 4 episodes and laughed my butt off while putting the finishing touches on my Trio TW-61. Thankyou sir!
Well done Sir. I would definitely have changed out those regulators and smoother caps because they've clearly been under extreme load due to the tantalums. The fuses did flash perhaps they need to be a surge tolerant type. I love this older gear its what I was raised on and so nicely built. I design a lot of my own stuff and I still build it through-hole in the same way and avoid SMD.... It's proven to be such reliable technology
I love the videos Mark, I look forward to new ones being made. Really enjoyed this one in particular, it's a really nice old delay, I'm so happy you got it fixed. It's pretty rare here in the US and quite pricey! Keep up the good work! Thank you Rb
18:04 Mark, I think you just composed the next science-fiction movie theme! I think this unit has had a rough life in some studio somewhere. Great video as usual mate, thank you!
sounds like a bbc sounds affect tape/record i was waiting for the doctor to appear or a darek to bust through the door screaming exterminate😆. it amazes me how a spent cap can cause them kind of problems another excellent video mark
Fantastic channel. Really fun seeing how you repair stuff. Love how informative it is. Getting this wholesome feeling as well. How you don't have 50 X more subs is beyond me. Keep up the amazing work! :)
I tryed soldering last night. It`s hard with cataracks lol. Looked a mess this morning in the light. I fix al sorts of things. love this channel. Wish I was so clever.
Those Roederstein caps always seemed to failed short! And the brown plastic ones don't usually fair much better, as anyone who's worked on vintage B&O equipment will know. Glad you blanket replaced the crucial ones!
Great video. I really enjoy your jolly, good nature, chuckling at every challenge. You set a fine example for me. I tend to get a bit grumpy when encountering setbacks. You've given me renewed vigor to tackle a troublesome effects unit I've left lie for a bit. Subscribed!
I discovered you channel a few days ago... Nice video's, verry interesting to see a colleague repair man puts a lot effort on this equipment! Looking forward to seeing the other video's! Thanks! Greetings from the Netherlands. 🤗🤗🤗
I have a few of the old Dynacord delay units for speaker delay. The battery dies and can leak. Think i replaced a few other things, a cap blew too i think, after years of no use. I didn't have the correct battery and needed it the next day. I had old lithium batteries that look like AA much bigger backup batteries. I couldn't solder to them so had to modify a battery cage and fit the larger battery that way. Pulled off a mini festival in a circus tent. very cool.
The inrush current looks quite close to breaking those fuses looking at the glow - even after replacing some old components. I guess its common for old components to draw more current than when they were new. I wouldn't be surprised if those fuses blow again after a few power cycles, especially is the unit is used in a warm rack.
7:42 "Black screws on a black surface" That is what Zaphod Beeblebrox said when he was in Hot Black Desiato's stuntship. "You press a black button and a black light turns on ...." Hitchhikers Guide to the Galaxy 😊
It's videos like these that further fuels my desire to continue to learn how things work as well as my beliefs of "why buy it when you can build it" and "why replace it when you can fix it". Great videos, please keep them coming!
Hey Mark, thanks for your channel. The most thing I like you is your smiling, happy face. Most of the electric and electronics professionals will have wrinkled forehead and tension (more over filled with ego). I really feel so happy till the end of your videos. Ohh BTW what is that foam spray that you used to clean the exteriors?
Hi Mark… I am a follower of your videos from Canada. Excellent work! … just occurred to me that I have an “vintage” Sony cassete deck TC 165 that needs attention… I know it’s not worth much, but sentimental value has no price…. Could be a nice piece for one of your videos, no? 😃 … anyway, congratulations and hoping for the next one!
always impressed with your knowledge of what to do - how did you acquire such learning Mark - if I may ask. It's a pleasure watching how you diagnose and repair these pieces of equipment. Loved it when you connected the speaker - it sounded like the beginning of a Hawkwind album - awesome!
You know I love how you fix it and then you notice some other problems with the potentiometers and capacitors and you decide to fix them too. Some repair text might say, oh I got it working and fixed its main problem and that's good enough, not you you make sure it works how it's supposed to work.
When I was still training, like in 1977, I used to maintain stuff on Ferries, fromrRadar, radios and to teletennis machines. I remember the size of the boards in them, about 2 feet by 18 inches, SRBP boards, which used to warp because they were crap, absolutely packed with 74xx chips, literally hundreds of them.
Good repair vid :) Just curious.. Do you buy these professional grade, Rack mount equipment, and then keep it as a hobby? Or just to repair and sell on? I am getting more into the professional grade power amps, Mixers etc, Buying them faulty, fixing them and then keeping them :) So far ive got a Peavey Cs1000 amp, A Warrior SB-500 Amp (old style Warrior, back when it was decent built stuff), I picked up a pair of PA 12" speakers off facebook, which happened to have a set of Eminence drivers :) Also picked up a Behringer DJX400 Mixer for pennies, just needed a connector cleaning haha.. Im new to repairing electronics, But im learning quickly :) Im also from the UK, Cambridge area :) Extremely pointless having massive power amps and big speakers, Can never "stretch their legs", But i find it fun to repair and keep em :)
Brilliant repair! I did wonder about the 'hot' tants near the start, they were showing as 34 and 28C on the Flir, not a huge temperature I would have thought? It's one problem with the auto-ranging on these meters that things appear 'white hot' when they're just the warmest thing in shot.
😆 2:21 STILL have mine Sinclair Spectrum! 😂 I have it in 1985! ans still the software on cassette tapes and some books and wrote the software lines, and one dot missing and its not working ore stops at that moment. also have then original tapedeck for that. pfffff..... 38 years ago, where is my time goes? 😊
Great work, I love to see older audio gear being salvaged. However, butanone is a known skin irritant, as well as being flammable, and shouldn't be handled with bare hands.
The two types of "crapacitor" I hate the most - ROE and tantalum. All ROE caps are replaced on sight. Bang and Olufsen hi-fi liked to use them in their audio equipment. Some receivers have dozens of them. Tantalums I refer to as 'hand grenades' because you never know when one will go BANG!
Mine too. I call them hand grenades because they are notorious for going BANG! just when you don't expect it. Either that or they go dead short as these ones did.
Old school for me I had change 15 leaky electrolytic capacitors for my 90s 1 pre-amp tube compressor/limiter and luckily I cleaned the board and it's fixed and it's about the 6th time I've turned it on since I've never used it. I like it more that I fixed it!
I must admit to a grudging admiration for your "let's push some joules into this & see what glows" approach when faced with a short. I work a lot on revox gear, & this wouldn't work- before you found the duff cap buried in the middle of an audio card, you'd fry off the delicate tracks on the PCBs. I always think revox boards look like they were made by a talented but highly strung silkworm.
Sad to see you didn't have proper axial electrolytic capacitor for replacement. This type of gear usually is on the road and sees a lot of vibration so there's a reason the manufacturer strapped them down with zip ties...
The troubleshooting, and cap replacements you found, will fix a huge amount of old gear which has failed. My test gear is very similar to yours and I picked up most of it very cheaply due to it not working. Dozens of tantalum caps later and I have all working gear. Let me know if you are ever in the Boston area or if you are going to the Dayton flea market, it would be fun to get together.
Seems to be the case! But do you replace w new tants or something else? I’m thinking they’ll last long enough… are they made the same as before or better?
@@2tallB I'll give a big "it depends." In some applications (Watkins Johnson receivers come to mind) they used wet slug tantalums and there is no way an electrolytic will fit in the space. So the replacement must be the very pricey duplicates. In most other cases a 105C electrolytic is more than sufficient. But beware, if you are working on specialized equipment which is designed for extreme temperatures you must replace with compatible parts which frequently means mil-spec hermetic electrolytics or tantalums. Another note with tantalums is that when they originally came out their manufacturers recommended ones rated just over operating voltage. So for example 15 volt parts used on 12 volt supply rails. This proved to be bad advice once there was enough field experience. So use higher voltage rated parts, for example 25 volt parts to replace the 15 volt ones. This will greatly extend life.
@@flyer617 thanks for your reply. I would just put another tant in, but I’ve seen it’s a pretty hot topic. (No pun intended!) I notice that they are utilized for speed as well so, like you said, it would depend on the circuit. I’m gradually learning, your comments help.
What he spray on there to clean the faceplate? I’m watching with captions at a slower speed, and I nearly crapped in my pants because it looked like oven cleaner! Lol
Flavio, laat je gasten nou eens uitpraten. Je tettert er steeds doorheen waardoor zij van hun apropos afraken. De andere presentatoren laten de gasten wel uitpraten.
Great video and awesome repair! Quick tip: the tang on those pots can be easily removed with side cutters, they are quite brittle and come off pretty clean
A renaissance man of electronic repairs indeed! Excellent troubleshooting skills Mark!! I'm looking forward for your next episode! - I reciently came across your channel - I've been binge watching it ever since! Thank You!
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I found Mark whilst searching for some info of how to repair my Sony RCD-W100 CD player. His exploits in the world of repairing all sorts of audio equipment really is quite captivating. Never have I seen such electronic expertise demonstrated in such a charismatic way. Just amazing!! Thank you Mark.
I recently restored a Dynacord GIGANT amplifier from 1969. It was a total nightmare. 79 capacitors, several resistors and transistors, new tubes, some bad pots, and so much more. After three months it's finally restored to all it's glory.
18:05 - sounds like the soundtrack to a Pat Troughton era episode of Doctor Who!
I had the crappiest day I've had in a long time at work today. Just binged about 4 episodes and laughed my butt off while putting the finishing touches on my Trio TW-61. Thankyou sir!
Mark you never disappoint, excellent work mate, and a joy to watch.
Well done Sir. I would definitely have changed out those regulators and smoother caps because they've clearly been under extreme load due to the tantalums. The fuses did flash perhaps they need to be a surge tolerant type. I love this older gear its what I was raised on and so nicely built. I design a lot of my own stuff and I still build it through-hole in the same way and avoid SMD.... It's proven to be such reliable technology
I just came across to your channel. I find it very interesting and liked it. You are joyful, confident, know what to do and how to do. Keep it up Mark
Your skill and patience is amazing 😊
I love the videos Mark, I look forward to new ones being made. Really enjoyed this one in particular, it's a really nice old delay, I'm so happy you got it fixed. It's pretty rare here in the US and quite pricey! Keep up the good work!
Thank you
Rb
Hi Again Mark, Another brilliant repair presented in a manner that makes electronics interesting with the right presenter. Keep up the good work
18:04 Mark, I think you just composed the next science-fiction movie theme! I think this unit has had a rough life in some studio somewhere. Great video as usual mate, thank you!
Хоть я и мало,что понимаю в английском, но вы большой молодец.
Привет от радиолюбителя из России, конкретно город Омск.
sounds like a bbc sounds affect tape/record i was waiting for the doctor to appear or a darek to bust through the door screaming exterminate😆. it amazes me how a spent cap can cause them kind of problems another excellent video mark
Fantastic channel. Really fun seeing how you repair stuff. Love how informative it is. Getting this wholesome feeling as well. How you don't have 50 X more subs is beyond me. Keep up the amazing work! :)
I tryed soldering last night. It`s hard with cataracks lol. Looked a mess this morning in the light. I fix al sorts of things. love this channel. Wish I was so clever.
Those Roederstein caps always seemed to failed short! And the brown plastic ones don't usually fair much better, as anyone who's worked on vintage B&O equipment will know. Glad you blanket replaced the crucial ones!
Ll
Can confirm! I had a Systron-Donner PSU at work with a dead channel. Turned out it was a shorted golden ROE. Dead short!
@@brainbuginfestation8548 They've definitely become a 'replace-on-sight' item, much like the dreaded RIFA X2 bomb!
Those Brown caps used in Quad hifi gear in the 1980's
i have always considered B&O to stand for Body & Odor of audiophile.
Enjoyed seeing this DDL relic bought to life!
It's a pleasure to watch someone who knows what they are doing
First time seeing this channel and holy shit this guy is just so charming and has a gorgeous smile. lmao
Hi Mark . The ROE Capacitors are very bad Capacitors.
Great Video . Thanx from Germany
Another great video Mark. Very interesting as usual. Thank you
those flat toggles remind me of my early days as a musician in in the late 80s early 90s!
Great video. I really enjoy your jolly, good nature, chuckling at every challenge. You set a fine example for me. I tend to get a bit grumpy when encountering setbacks. You've given me renewed vigor to tackle a troublesome effects unit I've left lie for a bit. Subscribed!
and have you never heard the expression 'beware the blue tants'. They were absolutely notorious in TVs.
I discovered you channel a few days ago... Nice video's, verry interesting to see a colleague repair man
puts a lot effort on this equipment! Looking forward to seeing the other video's!
Thanks! Greetings from the Netherlands. 🤗🤗🤗
I have a few of the old Dynacord delay units for speaker delay. The battery dies and can leak. Think i replaced a few other things, a cap blew too i think, after years of no use. I didn't have the correct battery and needed it the next day. I had old lithium batteries that look like AA much bigger backup batteries. I couldn't solder to them so had to modify a battery cage and fit the larger battery that way. Pulled off a mini festival in a circus tent. very cool.
The inrush current looks quite close to breaking those fuses looking at the glow - even after replacing some old components.
I guess its common for old components to draw more current than when they were new. I wouldn't be surprised if those fuses blow again after a few power cycles, especially is the unit is used in a warm rack.
They were supposed to be time delay fuses.
That was really interesting when those two fuses lit up!
great stuff, watching all your videos, Mark you should be on TV. entertaining, educational and very interesting, thankyou for your hard work. ay it
7:42 "Black screws on a black surface"
That is what Zaphod Beeblebrox said when he was in Hot Black Desiato's stuntship.
"You press a black button and a black light turns on ...."
Hitchhikers Guide to the Galaxy 😊
You have massive equipments library
It's videos like these that further fuels my desire to continue to learn how things work as well as my beliefs of "why buy it when you can build it" and "why replace it when you can fix it". Great videos, please keep them coming!
I don't recall ever reading about a failure mode of a capacitor as being "knackered".
Hey Mark, thanks for your channel. The most thing I like you is your smiling, happy face. Most of the electric and electronics professionals will have wrinkled forehead and tension (more over filled with ego). I really feel so happy till the end of your videos. Ohh BTW what is that foam spray that you used to clean the exteriors?
I BET its from a showman - at the autoscooter - and now his endless voice is not present anymore.....
Hi Mark… I am a follower of your videos from Canada. Excellent work! … just occurred to me that I have an “vintage” Sony cassete deck TC 165 that needs attention… I know it’s not worth much, but sentimental value has no price…. Could be a nice piece for one of your videos, no? 😃 … anyway, congratulations and hoping for the next one!
wow! out of all devices in the world you got this one! :D I have one broken DDL 12 too! I'd really like to fix it / have it fixed.
Good morning we love electronics and repairs and restoration of appliances we are together..one more writing...go my like always
Excellent work, as usual. You make it look so easy.
Mark i would have liked this much better if had demonstrated some music being played through that equipment…. Thanks.
always impressed with your knowledge of what to do - how did you acquire such learning Mark - if I may ask. It's a pleasure watching how you diagnose and repair these pieces of equipment. Loved it when you connected the speaker - it sounded like the beginning of a Hawkwind album - awesome!
You know I love how you fix it and then you notice some other problems with the potentiometers and capacitors and you decide to fix them too. Some repair text might say, oh I got it working and fixed its main problem and that's good enough, not you you make sure it works how it's supposed to work.
Yay, 2K subscribers! Congrats. Rising rapidly and deservedly so.
Thanks for the video Mark, very interesting repair
Very nice Guy and interesting video,! Regards from Germany
When I was still training, like in 1977, I used to maintain stuff on Ferries, fromrRadar, radios and to teletennis machines. I remember the size of the boards in them, about 2 feet by 18 inches, SRBP boards, which used to warp because they were crap, absolutely packed with 74xx chips, literally hundreds of them.
Good repair vid :)
Just curious.. Do you buy these professional grade, Rack mount equipment, and then keep it as a hobby?
Or just to repair and sell on?
I am getting more into the professional grade power amps, Mixers etc, Buying them faulty, fixing them and then keeping them :)
So far ive got a Peavey Cs1000 amp, A Warrior SB-500 Amp (old style Warrior, back when it was decent built stuff), I picked up a pair of PA 12" speakers off facebook, which happened to have a set of Eminence drivers :) Also picked up a Behringer DJX400 Mixer for pennies, just needed a connector cleaning haha..
Im new to repairing electronics, But im learning quickly :)
Im also from the UK, Cambridge area :)
Extremely pointless having massive power amps and big speakers, Can never "stretch their legs", But i find it fun to repair and keep em :)
Hi Mark can amps be sent for repair to you ??
Have you “robbed” a school physics lab for all of your bench’s?
I've never seen a school with equipment as high end as that.
Back driving those 3 terminal regs without input voltage could cause them to be damaged,unless the circuit has a diode between in & out.
Back driving?? It would be seeing pos/neg dc regardless as long it is referenced no issues
He's back!
I've had many issues with old ROE capacitors and that unit is full of them!
Nice one Young Mark!! (1982! You weren't born!! ha ha!)
Brilliant repair! I did wonder about the 'hot' tants near the start, they were showing as 34 and 28C on the Flir, not a huge temperature I would have thought? It's one problem with the auto-ranging on these meters that things appear 'white hot' when they're just the warmest thing in shot.
been doing this for 58 years and you are a good tech.
That was an involved job. But such a beautiful vintage device. I still have all my old 80s gear
Great video on a professional unit. All tantalum caps are time bombs. I've seen them blow their tops off!
Hi sir really your are genies, your are grant service Engineer i like you servicing method thank you once again.
😆 2:21 STILL have mine Sinclair Spectrum! 😂 I have it in 1985! ans still the software on cassette tapes and some books and wrote the software lines, and one dot missing and its not working ore stops at that moment. also have then original tapedeck for that. pfffff..... 38 years ago, where is my time goes? 😊
I like you my man 😊
Great work, I love to see older audio gear being salvaged. However, butanone is a known skin irritant, as well as being flammable, and shouldn't be handled with bare hands.
I suggest to replace dipped tantalum capacitors (blue) with oscon ones. Electrolytic capacitors have inadequate performance.
Thanks
The two types of "crapacitor" I hate the most - ROE and tantalum. All ROE caps are replaced on sight. Bang and Olufsen hi-fi liked to use them in their audio equipment. Some receivers have dozens of them. Tantalums I refer to as 'hand grenades' because you never know when one will go BANG!
Bloody tantalums. Bane of my existence.
Mine too. I call them hand grenades because they are notorious for going BANG! just when you don't expect it. Either that or they go dead short as these ones did.
Old school for me I had change 15 leaky electrolytic capacitors for my 90s 1 pre-amp tube compressor/limiter and luckily I cleaned the board and it's fixed and it's about the 6th time I've turned it on since I've never used it. I like it more that I fixed it!
That is the thing with Dynacords. Wonderful engineering, caps and pots always fail, often switches too.
I like that your desolder gun pump sounds so silent and doesn't buzz. I guess you're using a compressor that powers it ?
Mark is a Renaissance man of repair! Amazing work.
Japp 👍🙂
Always a joy to watch your videos. One question, when you find a leaking or shorting capacitor why wouldn't you replace all of the similar capacitors?
This sounds bit like something Deala Derbyshire would like. She called that sound a being made by a wobulator..
May I ask what socket set you are using. I’m having trouble finding ones that work with long shaft pots. Thanks.
I must admit to a grudging admiration for your "let's push some joules into this & see what glows" approach when faced with a short. I work a lot on revox gear, & this wouldn't work- before you found the duff cap buried in the middle of an audio card, you'd fry off the delicate tracks on the PCBs. I always think revox boards look like they were made by a talented but highly strung silkworm.
super great job !
Honestly your concept starting repair this Was not Been conducted by a proper logic usage !😊❤
Nie mógłbym pracować przy tak brudnych płytach czy innych komponentach bez wcześniejszego czyszczenia...
Sad to see you didn't have proper axial electrolytic capacitor for replacement. This type of gear usually is on the road and sees a lot of vibration so there's a reason the manufacturer strapped them down with zip ties...
The troubleshooting, and cap replacements you found, will fix a huge amount of old gear which has failed. My test gear is very similar to yours and I picked up most of it very cheaply due to it not working. Dozens of tantalum caps later and I have all working gear. Let me know if you are ever in the Boston area or if you are going to the Dayton flea market, it would be fun to get together.
Seems to be the case! But do you replace w new tants or something else? I’m thinking they’ll last long enough… are they made the same as before or better?
@@2tallB I'll give a big "it depends." In some applications (Watkins Johnson receivers come to mind) they used wet slug tantalums and there is no way an electrolytic will fit in the space. So the replacement must be the very pricey duplicates. In most other cases a 105C electrolytic is more than sufficient. But beware, if you are working on specialized equipment which is designed for extreme temperatures you must replace with compatible parts which frequently means mil-spec hermetic electrolytics or tantalums. Another note with tantalums is that when they originally came out their manufacturers recommended ones rated just over operating voltage. So for example 15 volt parts used on 12 volt supply rails. This proved to be bad advice once there was enough field experience. So use higher voltage rated parts, for example 25 volt parts to replace the 15 volt ones. This will greatly extend life.
@@flyer617 thanks for your reply. I would just put another tant in, but I’ve seen it’s a pretty hot topic. (No pun intended!) I notice that they are utilized for speed as well so, like you said, it would depend on the circuit. I’m gradually learning, your comments help.
Tantalum caps are a plague. Until today. When they fail they mostly shorten the
circuit. :(
What he spray on there to clean the faceplate? I’m watching with captions at a slower speed, and I nearly crapped in my pants because it looked like oven cleaner! Lol
Subscribed
vreemd de reacties onder deze videos. De meest recente van 2 weken geleden? Dit is toch live? En allemaal in het Engels. Ik befrijp er niks van.
Great job!
Most people I don’t think appreciate you very positive attitude whiz is hard to come by in life these days.
I found some german forum about this unit and apparently they eneded re-capping the whole unit
I watch your channel for hours!
Sounds like something from a 1950s sci-fi movie! 🤣
Excellent work, but I saw that +15V fuse pop at the end of the video....
the fuses glow but they don't pop
Congratulations.
Flavio, laat je gasten nou eens uitpraten. Je tettert er steeds doorheen waardoor zij van hun apropos afraken. De andere presentatoren laten de gasten wel uitpraten.
The sounds are very 1956 Forbidden Planet.
giveme skema Polytron GD 912M please
Sounds like effects from "Forbidden Planet".
SHALOM YAHSHUA
You said at the start you would start with the power supplies so what changed your mind?
can yo replace Tantalum with Electrolytic caps Mark
Танталовые конденсаторы заменил обычными алюминиевыми? Жди, через неделю опять принесут на ремонт со взорванными электролитами!
Great video and awesome repair! Quick tip: the tang on those pots can be easily removed with side cutters, they are quite brittle and come off pretty clean
Sir, how to test a soldering iron for safety like ESD etc.,
Why is this guy constantly laughing when there is nothing to laugh about?
A renaissance man of electronic repairs indeed! Excellent troubleshooting skills Mark!! I'm looking forward for your next episode! - I reciently came across your channel - I've been binge watching it ever since! Thank You!