Vintage Electronic Repair & Restorations feature heavily in Mark's workshop, but Mark will work on whatever comes in! From gramophones to games consoles. Antique radios, classic computers, retro Hi-Fi, jukebox parts, and lots of things he's never seen before!
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Thats beastist yammy amp iv ever seen.. and i worked at a hifi shop for year.. ps iv seen the A1 but it 5.1
Incredible work ethic❤
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.
Hello I have been watching your program for a while and you are very very good if you are near me I would bring my amp for service bless
Sir can you share circuit diagram
First class repair Mark. Your hinge repair was a bonus I wasn’t expecting. 💯👍
All the stuff average person throws away this guy could have saved it all !!!!
Just a word of caution when checking for shorts between transistors and heatsink. The aluminium oxide on the heatsink sometimes blocks multimeter probe from penetrate the metal below, therefore shows open circuit. The sure good approach is to touch the probe on any steel screws that is already attached to the heatsink. That will be more reliable way to check for short.
I see your a man of many talents Mark. I love your videos.
You are awesome... Thank you so much for sharing the knowledge you have... 👍👍👍
Whenever the world is getting me down I come here to watch Mark.
Mark, does that power supply not incorporate multi-turm pots? There is one other thing that puzzles me. When you suspect that one of two identical chips is faulty, why do you solder the suspected faulty one back in when you do the swap? If you just solder is the supposed good one into what was the 'faulty' channel and it works, surely you've proved that the other chip is faulty and you would still have a vacant set of pads ready for the new, replacement chip to be soldered in. Just a thought. Maybe I'm missing something.
fantastico trabajo!!!! yo aprendi con valvulares en 1982 aqui en santiago del estero al norte de argentina a los 16 años. me trajiste hermosos recuerdos de esas epocas ... hoy ya etoy casi retirado del oficio a los 59 por la vista y la firmeza de las manos. pero el amor a la electronica no se va mas...me especialize en computacion a los 45 años y eso me permite prolongar el vicio que es la tecnologia electronica.celebro que todavia haya gente como vos que trabaje con cosas de epocas antiguas electronicas... saludos desde el norte de argentina mark de un colega que se niega a retirarse...
Amazing attention to detail, well done ❤
Any chance you'd take a crack at a broken B-1?
Hi Mark, I have a Yamaha PSR740 arranger keyboard that has a built in floppy disk drive that now doesn’t recognise any disks inserted into it ( comes up as “Disk needs formatting” even though the disk has midi data on it. Do you fancy having a go at fixing it? It also has a fault on the mic volume control which I’ve tried to fix by installing a volume control on the back of the keyboard. It dates from the mid 2000’s . Cheers John B
They're beautiful brutes of amplifiers. Many years ago I repaired one of these that had suffered a "thermal event" that blew up one of the sides. It has a very nice safe operating area limit circuit that limits the output current near zero volts. This will prevent the amplifier overheating during normal operation with a blower passing considerable air over the cooling fins. The amplifier in question was being used in a practice room and the fans were turned off since they were noisy. This would have been OK, as the power out was probably around 10 watts instead of its usual flat-out front of house duty. The speaker wire was a bit dodgy and shorted out. The safe operating area circuit would have prevented any damage, had the blowers been running but... The thermal switch on the heat sink only lights up the over-temp indicator and doesn't shut the amplifier down. The output stage and the output drivers were all blown up. After the repair, I installed thermal switch buttons on the heat sinks to prevent this recurring.
Chapeau!!!
Lol, I would have just bought a new motor assembly!
WOW! How do you manage with all that SPAGETTI? LOL...
I know what Ide do with a Technics equipment that stops working. BIN IT !!!
Why not just get a new motor?
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 remember back in the 60’s.70s Bang olufsen was the Rolls Royce of hi fi! They certainly last a long time! Great video Mark! Fraser😁
Excellent work as usual. Can you please share the ultra sonic cleaning fluid recipe? Thanks for another good repair vid.
Çok güzel oldu ustam
CrackerJack presentation!
Mark, lamento que no tengas mas suscriptores, porque tu trabajo es fantastico. Luego tenemos personas por las redes haciendo el ganso con millones de visuializaciones, esto demuestra el retroceso que esta teniendo la socidad y no se trata de nuevos tiempo, solo es que pocos jovenes tienen interes por algo que requiera un esfuerzo de pensamiento. En cualquiera de los casos sigue asi, tu trabajo es genial.
Great channel Mark. Only discovered very recently. Can you tell us what desoldering tool you are using for your repairs? Keep it up and looking forward to more videos. Thanks
33:33 ... without seeing the video it sounds like an analog synth
This guy is like the Columbo of electronics erm just one minute Metal oxide semiconductor lol 😂😂
kzread.info/dash/bejne/qKtpqbWFeta_crw.htmlsi=rOPXIuSRT1Nanp2X Hi Mike Can you please do a fix on one of these Sonos Play 5 Gen 1 No power and others Cheers Saf
I had a fair share of such repair attempts. Most of the time I ask the customer if they want the amplituner back with just the "amp" functionality, bare minimum, and most of them say "yep", so I just disconnect everything that is not related to the amp/preamp or power supply, and add an "AUX in" functionality. But it's sad to do such a thing, only because the IC that died is no longer being made, and it has to have proprietary software on it...
I owned a Dcc, rack version, from Philips. I thought it could have been a good alternative to DAT in my studio, but it definetly wasn't
Why not use SIL-Pads instead of heatsink compound and MICA washers?
It's amazing to think that Mark's skills include the knowledge to diagnose and repair his own test equipment. Warranties on electronics mean nothing to this guy. :)
for me looks like airplane dashboard
Look I'm nowhere near the expert electronic technician you are, but I definitely hate anyone who pulls apart a device and does not have the skill or the forethought to save the right screws. Love your skills, love the videos, a great knowledgeable channel. Keep up the good work. Very watchable channel.Love the background stuff.Maybe the last person did not bother to save the screws because he or she deemed it unfixable.
Mark, it seems with all the gear you own, you do not have a set of nut drivers. I cringe every time I see you or any other Tech use Adjustable wrenches or pl1ers.
Gracias por enseñar lo que haces, pero lastima que se están acabando los verdaderos técnicos, ahora te dicen mejor compre otro, y veo esto y es respuesta y solución, que será en esos tiempos?
Я постепенно становлюсь твоим фанатом Марк! 👍👍👍👋👋👋👋
Bookbinders use Japanese tissue paper for page repairs, a couple of crossed layers that might be an easier and stronger alternative. alternative
That's got to be well over $1000 worth of work. I hope people are paying what it's worth, for the expertise and work, that goes into fixing these old units up!
Nice shop. What are the approx. dimensions? I didn’t know you did projects other than electronic ones.👍 I have a piece of hardboard (not sure of the UK equal - Masonite?) on top of my bench. It’s held in place by screen moulding around the perimeter. When it gets destroyed, it’s an easy replacement.
you are a genius man your video are very amazing
Great repair video thanks so much,I've shared and liked.I have a German gramophone and same problem slowing down.Bought it fr my son fr his Birthday.
You won't anyone better than mark on the web...
No Job too small
Never liked Peavey, the only few times I had to used their amps I always had problems
Sony 5Sony 5.1 amplifier repair