YAMAHA's Professional Amp
ฝัง
- เผยแพร่เมื่อ 11 พ.ค. 2024
- UPDATE:
So I’m running a 3-part LIVE workshop that takes us on…
A Time Travel Through Vintage Electronics.
We’ll rewind the clock, dive into the tech of the times…
(and study the very history of how things were broken and repaired has evolved)
The workshop is coming soon, but if you're reading this then you're in luck (or not)...
And there's still time for you to sign up using the link below:
www.menditmark.com/mend-mark-...
The workshop dates are mentioned in the link above too.
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Mark rebuilds a battered 1976 vintage Yamaha P2201 Amplifier. "There's a fault with one channel", they said.. But who took all of the parts out?
Special Mention to Lighthouse UK Ltd, who provide Mark with some much required support for the Label Printer (see last 5 minutes of this video for the full story). Should you contact them, make sure you mention the channel!
www.lighthouse.uk.com
For the super-fans, you are welcome to support Mark, and get behind the scenes peeks on the Patreon page:
www.patreon.com/MendItMark
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UPDATE:
So I’m running a 3-part LIVE workshop that takes us on…
A Time Travel Through Vintage Electronics.
We’ll rewind the clock, dive into the tech of the times…
(and study the very history of how things were broken and repaired has evolved)
The workshop is coming soon, but if you're reading this then you're in luck (or not)...
And there's still time for you to sign up using the link below:
www.menditmark.com/mend-mark-workshop
The workshop dates are mentioned in the link above too.
I signed up immediately! I didn't understand a word because I don't speak English but I'm sure it will be great!
? M)) p)ft
I signed up, can't wait. Greetings from Milan, Italy.
Is it going to be on youtube, or is this going to be somewhere else like Twitch or something?
of course, for me in German 'VE99' and 'curious marc' is nr 1, than 'mr carlsons lab'..
Is there anything that you don't look forward to more than a new Mark video? Keep them coming please!! Also, it would be great to hear how you gained your knowledge. Electronics, chemical, mechanical, you know it all!
Absolutely - go straight there when there is a new one!
Totally agree!
I'm so happy when a new video is uploaded!
I agree!
I don't know if anyone else notices the superb editing & audio on Mark's videos? Just the little touches like changing the sine audio level as it's varied on the amp, sublime.
I recognise that amp as one from Birmingham Repotory theatre. It came into where I was working at hte time for service. The initials JD belonged to John Deakin one of the service technicians.
A long time ago in the seventies. He has since passed away sadly.
I knew John quite well. He did most of the large heavy audio equipment repairs in the midlands. Nice guy, always helpful. Sorry to hear of his passing.
"A long time ago in the seventies. He has since passed away sadly." But his amp lives on, we should call it 'John's amp' serviced by Mark
Let's get this man some more subscribers.
There are a lot of channels that are really crap that have more subscribers than he does.
Mark is the real deal when it comes to repairing electronics!
This man takes so much time and effort in putting these videos together.
In such great detail, next to nothing skills and when something is not available, he makes it himself.
Mark is such a nice guy, great knowledge and very entertaining to watch.
Every time he puts out a new video like this, you can take your popcorn and drinks and watch this from start to end like you watch a new episode from your favorite series.
Keep up the good work Mark, great to hear you move to a new workshop.
Totally agree. I’m sure he’s a guy you could have a drink and share a laugh with too.
Yep, I can think of one with double the subs and I don't get it !
Spot on! Let's get him more subscribers
Like watching a whodone it on telly
I couldn't agree more - unfortunately due to the stupidity of the vast majority of the human race most are drawn to the loud, flashy dumb stuff. This of course applies to all walks of life, not only TH-cam videos.
Fabricating those transistor covers is just next-level refurb; not only painting, but matching the text. Awesome.
Mark has the skills and tools for every problem. He even has a labeling machine for this very purpose that cuts out the warning labels per spec.
I would have used TO-3 plastic covers!
Mark exudes confidence and competence. You know he’ll sort this disaster
Dare I say that Mark's videos are on the edge of being therapeutic to watch! Thanks so much, Mark!
He is such a positive guy!
Absolutely! I 100% agree!
He's in my top 3 list here on YT for sure. He should have a million subs and his channel will grow and grow if he stays with it.
it's approaching an addiction for me. I love this guy. Every aspect of his uploads are excellent.
No surface mount items, no chips...ah the joy of components that can be examined, tested and replaced without magnification!
Built when amps were designed to be fixed before tomorrows gig.
Mark shows us a level of craftsmanship that many ‘repair shops’ don't even know exists.
The sticky residue on the cables is from the smoke, not dry ice 😁 . The smoke fluid is water and glycol, and the glycol is the thing making the smoke white. If the smoke is used in a nightclub without any ventilation, the glycol will condense on stuff. A typical fault on movingheads is the condensed glycol on the cables inside, making the dust stick on them, and making them brittle.
Imagine what it does to ya lungs.
@@BTW... and yet some people are now carrying around pocket sized smoke machines to suck on them at any free moment they have
Glycol is in "vape" smoke. Doubt there was much of that in the '70s and '80s. I think the sticky goo is phthalate plasticizer in the clear PVC tubing, which gradually sweats out to the surface (making the tubing itself gradually become more stiff.) That's why it's only the tubing that has sticky crud on it. It's an easy-to-replace item.
If it was gigged, it's probably real smoke.. I replaced the pickups in a Strat I used to use before smoking bans last month and it still stunk of cigarette smoke.
@@BTW... it's also used in inhalers
Mark is one of my favorite net personalities. Straightforward with no mucking about. Can't wait to see the new digs.
@OldFatBubba many of these techie type people are kinda grouchy. Mark has got the best, most refreshing personality that Ive experienced. His channel should be in the millions of subs. Its money in the bank when he uploads a video. Hes the best by far. One of the main reasons I do TH-cam.
This is more than just mending. To see someone taking care to recreate missing parts from raw steel is truly a labor of love.
And a power amp is ready to re-enter service! Power amps are among the most useful pieces of vintage tech there is. Even a really good one from the '70s or '80s, once properly sorted, is really good even today.
You won’t find anyone as professional as Mark he’s the best !
I bet if you sent Mark a shoebox and told him it was a McIntosh amp, you’d get a McIntosh amp back in 10 business days 😂
😂😂😂
I'll be sending him my Dumble next week then.. I don't know why it's not working. It's very light too..
LOL!!!!
I can just hear him say, " some parts were missing so I had to improvise with a bit of wood and metal work here in the workshop." LOL!
Can we all admire what appears to be masking tape with “nope!” written on it :D
"Nope!" ... We can't!
I do that at the Cooker before the wife begins
The abject anxiety I get watching Mark completely dismantle these old buggers is offset by the dopamine blast I get when it comes back together and actually works.
A great end to a hot and sunny weekend.
I like the way Mark goes the extra mile to ensure that all repairs leave in a safe condition.
Best of luck moving to your new workshop.
Genuine shock when Mark said he'll be moving shops, I thought he loved the clutter!
Extremely organized, however the lack of space is only somewhat evident(;
It's better to watch you working than to watch a Hollywood action movie. Lots of love and regards from Pakistan. Stay blessed.
Good afternoon Mark! I can relax, cuppa tea, and watch your great video!
A sunday with Mark! Splendid
Mark, you make these repairs look so easy! The missing parts is simply amateur workmanship and unforgivable.
I think when the former repairman found out that the blown transistors were out of production, he didn't bother to look for replacement, like Mark did.
@@drummerhammar It was very different 25 years ago. We don't appreciate how easy it is to source parts these days. I had to basically give up on quite a few things back then because parts simply were not available.
Mark's a gentleman leaving out displaying his underlaying knowledge and the judgement, though he sometimes subtle hints of what he thinks about other techs' solutions. In this case one cannot know the reason behind not finishing the repair by the previous tech, I know just to well that sometimes projects of gear you don't really use gets pushed behind.
Also possible that the amp was cannibalized for parts (those rare transistors in particular).
Back in the day, If it works for tonight's gig, it works until it needs fixing again.
Not only are you extremely talented in electronics but you also understand how to make things from sheet metal and how to measure correctly. Absolutely awesome and I appreciate your TH-cam channel one of the best around.
Your cheerful confidence seems born of experience and a good attitude. Most of us would be scared to tackle the projects you take on in stride.
Mark,
You've even made it to the Netherlands. I find your videos so informative and well-explained. It's just a positive therapy to watch you while doing the work you perform.
Mark, your attention to detail and general knowledge and professionalism never ceases to amaze. Good luck in your new workplace
Meaning to say this for a while. Whoever designed the sound for your videos is a genious. The precision, but also calm inducing.
i watch his videos only for pleasure..this guy seems very humble and nice...
Cover fabrication at the end was just amazing. Really rooting for this channel to grow big.
Looking forward to seeing the new workshop.👍🇩🇰
Excited to see the new workshop!🙂
Absolutely amazing repair! You can't admire more that these amps never get old!
Thanks Mark
He’s Mend it Mark AND Bend it Mark…!!! those covers are awesome! 👏 🔥
Mend it, Bend it and Print it Mark!
This channel is criminally under appreciated, when you reworked that motor a few videos ago that hooked me in.
He’s so clever. It seems like there is always something new to learn in each video.
I really like how absolutely every single thing that was done in this repair is left in the final edit. Really gives you a good idea of what's happening that a lot of other channels don't provide
I am a hard man to impress but you impress me very much Mark
I'm sure that Mark is not that wayl inclined
I'll miss the old workshop for sure, Mark. Quaint. Calm. Homey.
New workshop coming !!! Interesting Mark.
I prefer to keep things as they are. It is difficult enough to keep track of where I put stuff 😄
This is my first time coming across your channel, and what a pleasure! Your repairs are so thorough, and your positive attitude is a joy. It's always satisfying to see old equipment being repaired instead of just thrown out. Excellent work.
It feels like Christmas! Mark has turned up!
I know sod all about electronics but I'll happily sit watching Mark carry out his repairs, a true craftsman at work! Love the intro music too! Look forward to seeing the new workshop. Thanks Mark!
I mostly have no idea what you are talking about but your style is very engaging so I keep watching
Thanks Mark. Real entertainment on a sunny Sunday afternoon in North west Germany
This is some serious workmanship. Mark you are amazing.
New workshop?.......looking forward to it!
How many of us would take one look inside that thing, and say, "Sorry, no way this can be fixed"?
Congratulations on the new shop . . . hope the cat likes it!
That looked like a right basket case, but you sorted it all out very confidently and professionally. Love these videos and the "professional" gag at the start of this one. Would love for you to feature the cat more often!
The making of the heat sink rail covers was great alone.
Excellent video and skills in a fun presentation.
Those transistor covers were such a clever idea. The printer trick was clever as well.
I'm kind of sad that you're moving to another shop yours has such honest character
Thorough job Mark as always, you didn't cut any corners...fake parts are a real problem...came across it when trying to source some 2SC2922 and 2SC1905 Sanken devices....The real problem is not finding modern equivalent devices that can deliver the power, but can match the Early Voltage characteristics as well.
Outstanding work Mark, just outstanding. A master of many, many talents.
I think I'll miss the current/old workshop, it has such a one man in a shed vibe, a bit of a cosy warm feel to it. However, I can't wait to see the new workshop, you might even have enough space to swing a cat and have a bit of elbow room.
Sunday is complete… cold beer sitting in the garden with Mark… 🎉😂
That is the sibling of the P-2200. That was a gorgeous amp with Awesome meters. Its downfall was, Yamaha made custom meter drive amp IC, an IG0.... something or other, that tended to fail and render the meters useless. It had a big Toroid transformer for mains. I never have seen a P-2201, but I can guarantee you that Yamaha would never leave their output transistors open on external heat sinks. This is a case where some lame servicer lost that stuff.
Mark, you go after these complete basket cases! Once I saw all those transistors missing, I was yelling TRASH IT! You are amazing!
This is a work of art. Been watching for a while and this channel is the best! When MendItMark meets MakeItMark, I feel a sense of serenity. Mark, get that second channel registered.
mark im always amazed the amount of skill you have this shows your a true craftsman :)
I'm American and I love your accent. You are my current favorite TH-camr. Awesome job, I was mesmerized.
Superb video - it certainly brought back memories of casting envious eyes over Yamaha amps back in the 1970s, which seemed very classy at the time.
I really admire the methodical way you work, your patience and your perfectionism. Your love of bringing back to life packages that no one else would repair. I don't think there are many like you. Even the videos are well taken. Thanks for what you do.
One of the best content for any electronics, electromechanical devices troubleshooting, repairs, upgrades and RESTORATION to better than OEM, period
always a pleasure to watch this electronics wizard at work...very nicely done Mark..well done.
This is the most impressive one I've seen from you so far. It is really inspiring to see all the steps, including the making of custom parts. Makes me also dream of having a bigger shop and some more testing equipment and specialized tools. Looking forward for your Time Travel live workshop
For others watching - you have to be careful when substituting transistors in a power amplifier. It isn't always enough to make sure the replacements have the same or better specs on things like voltage and current - two important criteria Mark did not show here is Ft and Cob. You can have oscillation issues in some amplifier circuits if the outputs arent of similar speed or there is more/less Cob capacitance.
Yes, seemed all too simple a sub. Was there a step missing from the work - to match the amps output gain? After all, the driver and output transistors were substituted.
@@BTW... Negative feedback makes the transistor gain characteristic less important -- as it is somewhat close.
Gain varies more than that difference from part-to-part.
@@BTW... No issue with gain as negative feedback deals with that, but stability can be an issue.
I might have considered replacing the transistors in both sides just to make them a matched pair, though i doubt it is really neccesary.
what Mark might have done off camera, is tested with a square wave into a load, and looked at the scope. You'd see potential instability as severe over/undershoot on the waveform, with ringing. You'll always get some peaking but as long as it's not excessive and there is little to no ringing, you are OK.
The original 2SC1586 transistors had an Ft of 10MHz and Cob of 110pF, where as the MJ15023 has an Ft of 4MHz and Cob of 600pF. Unfortunately there's no fast/low capacitance power transistors made in the TO-3 package any more.
I also noted that the working channel had a failed Zobel network resistor. That's usually a sign that the amplifier has been oscillating. Maybe that's what took out the channel that had no parts in it.
Very intriguing! Not only impressed with your electronic skills, your design and fabrication skills also! Thank You Mark!
Just loved watching thisv-Takes me back to my Royal Navy Days doing component repairs to communication and Radar Systems. What a beautiful trip down memory lane.
This show is the best, he got every tool needed under the sun.
Yesss... Mend It Mark is back. Is my favorite youtuber. 😀
I aquired a P2201 in 1986. Legendary. Indestructable. Great sound at home in the HiFi and kicked ass in school gymnasiums, weddings and hockey arenas. That and the P2200 are some of Yamaha's best work.
Having worked with that model in the early 1980s, I can't agree with your assessment at all. Yamaha makes some excellent drums, great brass instruments, very good motorcycles, and they make amps. Not great, not good, but adequate. Yamaha's amps have rather a lot of negative feedback which gives them decent harmonic distortion specifications, but they are an unpleasant source of phase distortion.
Cheers,
Alan Tomlinson
@@diegorhoenisch62 _Phase distortion?_ What?
I mean, with the undegenerated BJT input stage it's not going to be a slew rate king, though relatively high gain ought to help with that, pulling off an amplifier this powerful with an EF2 seems like a bit of a stretch, and the output stage is a tad underbiased as they usually are... but it is a PA amp after all, they're not expected to be the last word in fidelity, and this one still easily qualifies as hi-fi.
If you want a model that's beyond reproach by any standard, the ones to look for would be from their mid-80s lineup, like the P2250. Later ones went back to being a bit more on the rustic side, and by the mid-'90s even the noise level had begun to suffer.
Very impressive work you do not everyone can do...fantastic building of the Transistor shields...cool..
nice Equipment you have either...and a great knowledge in Electronics...
Excellent work Mark. Love your attention to detail 👍👍
Thanks for taking the time for this Mark. Hope great things in your new shop!
Good Lord!?! What a toroidal transformer! Unlike any other transformer that I’ve ever discovered in any other piece of appliance.
Nice. Balanced inputs. Your workshop is always pristine. You figure any engineer with an antique transformer curve tracer has had for himself a pretty long history of experiences in electronics. Mark, I don’t know where you got it from, but your English is the real treat of your channel! Wherever you’ve been, you really have a pleasant voice!
2am in Australia, Mark is back, so I'll have to stay up to watch this! Must have taken ages to edit this mate, well done as usual 👍
I am really happy for you. Well equipped, well knowledged. And I am gone miss your work bench. Work safe my friend.
Is there anything you can't do? You even have a mini metal brake. Beautiful work Mark.
Talk about going above and beyond!! I must admit to having very little clue about the technical stuff - but I look forward to every video! Thanks Mark.
Love your work Mark. Best wishes in your new workshop.
Congratulations on the new workshop! Your channel is awesome, you are a true craftsman 😊
High quality soldering - Kudos!
Fantastic work as always, hope your cat got over the trauma of the desoldering
Amazing work Mark. Love watching you in action.
Woot woot!!! New repair video. Can't wait to see what you have in store for us at your new location!! Congratulations, Mark. Thank you for sharing your knowledge with us.
Your videos are not only educational but also a delight to watch.
I am always blown away by your attention to detail Mark.
And this Vid even more.
Not only the electronics!
Transistor covers gave an “Out of the Park” look of professionalism.
Wow)
Hey Mark really enjoying your videos. Always cool to see the contrast of modern and vintage tech and how they work. Thanks for the great content!
Once again you have gone over and above on this rebuild. That amp will last for many more hours now. Very nicely done.
I have absolutely no clue about electronics but why do I watch every video?? Love the channel 👌👍
Love watching your videos. Even though i know nothing about electronics or amps, it's still a joy to watch you fix old equipment. Goo luck moving to your new workshop.
Love watching you work champ!
I have to commend Mark again, not just for the diag and repair work, but for the camera work and editing.
He doesn't just record one camera angle, but usually gets a close-up of every single step.
Like adjusting the pots, he often shows a shot of the pot itself, then a shot of the multimeter.
In this video, he showed BOTH pots, the inrush current, a close-up of turning the power switch on and off, plugging in the jacks, adjusting the volume, showing the o'scope, showing the distortion meter, and even making new cover plates for the transistors.
I can't imagine how long it takes to make one of these vids. lol
Great channel.
indeed. The viewer almost has a better view than the engineer!
Amazing attention to detail, well done ❤
So nice to see vintage lab equipment. I used to fix amplifiers and build tube amps and this gives me memories. Replacing power and driver transistors can be problematic sometimes with old amps but you made it look easy!
Congratulations on your new workshop. 🎉
Congrats on the new workshop.. looking forward to seeing it .
Wow, I enjoyed watching every video you have, Mark. I am glad to find your channel. I wish I had those instruments you have there. I am eager to see the true sound of that amp next time for a sound test, Mark. This is a complete repair. Many thanks! Keep doing what you do.
Well done!! Love the details, and showing us how you got there.
oooh new workshop!! Can't wait to see it Mark! Great job on the amp, great video as usual
Well done fixing that amp Mark, you went above and beyond. Subscribed,