Thank you so much for repairing my amp Trevor!!! It was a night and day transformation in the sound quality. I can’t recommend Trevor’s Bench services enough.
JVC overlooked by the brand hunters. JVC made some fantastic equipment. I enjoy the turntables. Victor gear is rare in North America, but top quality. Banana jacks are always a nice upgrade on these units when the spring terminals are kaput. To each their own. Those wafer switches I use metal polish on. At least these are easy to access. Yamaha are a nightmare scenario. Trev, you kind of gypped us on the footage of the relay rework and the mute switch rework and the terminal install. Let it slide this time.
@@TrevorsBench Dude, that's why I watch. Your tenacity and patience with the tedious bits is inspiring. And these days inspiration is in short supply. If you can escape the CCP I've got an SX980 project with your name on it.
What a far cry from their plastic efforts of the 90s. That's a quality piece. Really admire your work.. it's a joy to see things re used and made good and the quality of these things was so beyond modern production.
I agree w your assessment of what killed those caps, some kind of petrochemical got in there and swelled the rubber end caps. That is a beast of an amplifier, with a serious power supply. I feel your pain arranging it around on your bench.
I became so enamored with the JA-S71 amplifier that I bought another one just to have it as a backup. Also has two tuners JT-V71, cassette deck KD75 and record player JVC QL-F4. All original and works perfectly. Both amplifiers are used in different rooms. Fun fact The Swedish Institute of Technology has measured the power of the amplifier and it delivers 105 watts of power even though it is specified for 80 watts. They can be seen on my CZcams channel. Maybe I should find someone in Sweden who can recap them. Trevor thanks for a fantastic YT channel.
I've discovered I like watching your no shortcut videos. Most would find the single component, replace it, and send it out. Your service is intended to last longer than the next failure. I wish you weren't located so far away.
I've not run across bulging caps on the board side like that. Interesting. Beautiful integrated amp. JVC made good stuff back in the day, but like most other companies did during the mid 80's, they went to black plastic and cheaper designs while living on their laurels from the past. Many went out of business because of it. Bean counters have destroyed more good companies than you can shake a stick at. HH Scott and Fisher come to mind. Thanks for another interesting video!
It's not the bean counters that destroy companies. It's the executives who dictate that the company save money and order the accountants to cut budgets. They are the problem.
Thank you for your time on this much needed maintenance adventure. This amp looks like a very well built machine; the internal layout looks stellar for the technician, with the exception of a bottom cover. What's that old saying?, "They don't build 'em like that anymore." Please let us know how this unit sounds! Thanks again.
That's a great job ! You are a really professional ! Congrats for your work and passion! I have the same amp, fully serviced, sounds gorgeous! Deserves efforts to be back on track:)
@@TrevorsBench I have both the amp and the tuner as well, my father bought them new in the mid-70's. Wish you were located closer to me so I could have them serviced :) Such beautiful pieces of equipment.
Looks very pretty on the outside, however what is on the inside is a nightmare, JVC, Appreciate this Trevor, why...........because it is my most hated mfg from prior experience of their failed attempt with quality control and reliability. Power board buried under Tone board, not too bright. Very much enjoyed the tear down of speaker wire connectors. Relays are the greatest thing invented, sorry my Celestion Ditton 66 speakers are pretty important to me. Cheap Elec Capacitors as always, I am more to think something got spilled (alcohol beverage) into that, I do not see any type of oil doing damage like that.
I notice you changed the orange caps out for film caps? curious why you used film caps in their place. xraytony gave an interesting chat in a recent video about how using the film caps instead of electrolytics can change the sound.
Yes, I replaced some low value electrolytics with film. I believe they are much more stable and reliable. The difference in sound quality is debatable, just like was pointed out in Tony's video.
Some orange capacitors on path of signal no rubber on bottom cap and name LLC (low leaking) capacitors and no replace with standard electrolytic capacitors! Only sugestions
Hi i have this exact unit one channel not working.. just wondering what is the cost as for a similar rebuild is worth please..i have no idea... thanks for your time and upload very interesting to watch a professional at work..Sir.I would not have the patience to do what you do 😆🙏
I hold my hart last week when the output of one channel of my amplifier went bad .............to discover it was the muting switch , the one I neverv use............
I can't believe I gave one of these away when I was a teenager... I found one of these amps at a recycling facility here in Denmark, and took it home on the back of my bike. Sound in both channels, It still had the square cover and all it's switches. Took it with me to be semi permanently used for playing music at a frequently youth assembly location. My dumbass gave it away to another teen because I was to lazy to carry it home after the assemblies were over and done for...
I have this amp and it's not working at all. It has power but I get no signal coming through. So far I only had a quick look at it, however, so I will finish watching this clip and see if it is of use in my case.
hola excelente video,tengo un amplificador victor modelo ja-s41 el problema de este amplificador es que enciende y el reelé se desconecta a los segundo y está así todo el tiempo no sé cual será el problema seria una gran ayuda suya saludo cordiales
Have this amp as well, and had it serviced awhile back here locally in Ohio for the same issue - that is no sound out of one channel. Now I'm getting some occasional static, thumps and hum. Had anyone else had this issue, and if so, what worked to resolve it?
Dilemma: you never know what value a cap had when installed. For me a 470 µF cap that measures 468 is most likely bad. These often go for 10% or more above rating when new, so my guess is that it has already lost 10% and steadily on its way out.
Thank you so much for repairing my amp Trevor!!! It was a night and day transformation in the sound quality. I can’t recommend Trevor’s Bench services enough.
No problem, hope you enjoy it. I'll be starting the tuner in a couple of days. The vid for that will be posted in about 4 weeks
Sounds great. I’ll look forward to hearing back from you afterwards. 🙂
JVC overlooked by the brand hunters. JVC made some fantastic equipment. I enjoy the turntables. Victor gear is rare in North America, but top quality. Banana jacks are always a nice upgrade on these units when the spring terminals are kaput. To each their own. Those wafer switches I use metal polish on. At least these are easy to access. Yamaha are a nightmare scenario. Trev, you kind of gypped us on the footage of the relay rework and the mute switch rework and the terminal install. Let it slide this time.
I thought you guys would be bored with watching me clean switches and pots, that's why I leave those out to keep the time down
@@TrevorsBench Dude, that's why I watch. Your tenacity and patience with the tedious bits is inspiring. And these days inspiration is in short supply. If you can escape the CCP I've got an SX980 project with your name on it.
@@TrevorsBench nah man. Tech geeks love that stuff and thats what ffwd is for if you don't want to see it. John must be living rent free LOL.
I just re-subscribed, but .... Trevor, please show all your work. Seeing all the steps is why we tune in.
just love these old school designs...very elegant!
What a far cry from their plastic efforts of the 90s. That's a quality piece. Really admire your work.. it's a joy to see things re used and made good and the quality of these things was so beyond modern production.
I agree w your assessment of what killed those caps, some kind of petrochemical got in there and swelled the rubber end caps.
That is a beast of an amplifier, with a serious power supply. I feel your pain arranging it around on your bench.
I became so enamored with the JA-S71 amplifier that I bought another one just to have it as a backup. Also has two tuners JT-V71, cassette deck KD75 and record player JVC QL-F4. All original and works perfectly. Both amplifiers are used in different rooms. Fun fact The Swedish Institute of Technology has measured the power of the amplifier and it delivers 105 watts of power even though it is specified for 80 watts. They can be seen on my CZcams channel. Maybe I should find someone in Sweden who can recap them.
Trevor thanks for a fantastic YT channel.
Thanks for watching
I've discovered I like watching your no shortcut videos.
Most would find the single component, replace it, and send it out.
Your service is intended to last longer than the next failure.
I wish you weren't located so far away.
Thanks, I wish I could help all my viewers but I'd be overwhelmed with work and it would no longer be a hobby
Excellent work, Trevor. That’s a nice looking amp. Thanks for the consistent quality of your content!
Ooh ! I had one of these amps years ago - a very smooth sounding piece of equipment .
The JVC stuff is fantastic value still, its somewhat "under the radar".
I've not run across bulging caps on the board side like that. Interesting. Beautiful integrated amp. JVC made good stuff back in the day, but like most other companies did during the mid 80's, they went to black plastic and cheaper designs while living on their laurels from the past. Many went out of business because of it. Bean counters have destroyed more good companies than you can shake a stick at. HH Scott and Fisher come to mind. Thanks for another interesting video!
It's not the bean counters that destroy companies. It's the executives who dictate that the company save money and order the accountants to cut budgets. They are the problem.
Wow, it looks like it's right out of the box! Clean as a whistle.
Thank you for your time on this much needed maintenance adventure. This amp looks like a very well built machine; the internal layout looks stellar for the technician, with the exception of a bottom cover. What's that old saying?, "They don't build 'em like that anymore." Please let us know how this unit sounds! Thanks again.
"A" grade work as always. Thanks, Trevor.
Beautiful piece of machinery.....
That's a great job ! You are a really professional ! Congrats for your work and passion! I have the same amp, fully serviced, sounds gorgeous! Deserves efforts to be back on track:)
Quality repair Trev, as always.
Nice TO3 style transistors on a heat sink that would cool a volacano :-D
A smashing amplifier, i love the quality.
Another one build in the golden era ...............;;imagine what it would cost today to build amplifiers again the same quality way ! ?
Yes, I agree. I have the matching tuner here for service that will appear in a future episode. I'm curious to see that one too
@@TrevorsBench I have both the amp and the tuner as well, my father bought them new in the mid-70's. Wish you were located closer to me so I could have them serviced :) Such beautiful pieces of equipment.
Looks very pretty on the outside, however what is on the inside is a nightmare, JVC, Appreciate this Trevor, why...........because it is my most hated mfg from prior experience of their failed attempt with quality control and reliability. Power board buried under Tone board, not too bright. Very much enjoyed the tear down of speaker wire connectors. Relays are the greatest thing invented, sorry my Celestion Ditton 66 speakers are pretty important to me. Cheap Elec Capacitors as always, I am more to think something got spilled (alcohol beverage) into that, I do not see any type of oil doing damage like that.
Nice video Trevor
Thanks Joe
All good Just do a re-cap as I all ways say change the caps simply.
I notice you changed the orange caps out for film caps? curious why you used film caps in their place. xraytony gave an interesting chat in a recent video about how using the film caps instead of electrolytics can change the sound.
Yes, I replaced some low value electrolytics with film. I believe they are much more stable and reliable. The difference in sound quality is debatable, just like was pointed out in Tony's video.
Some orange capacitors on path of signal no rubber on bottom cap and name LLC (low leaking) capacitors and no replace with standard electrolytic capacitors! Only sugestions
JVC where build very very very good simple
Some people hate them, some love them. This one deserves the love
Hi i have this exact unit one channel not working.. just wondering what is the cost as for a similar rebuild is worth please..i have no idea... thanks for your time and upload very interesting to watch a professional at work..Sir.I would not have the patience to do what you do 😆🙏
I hold my hart last week when the output of one channel of my amplifier went bad .............to discover it was the muting switch , the one I neverv use............
I advocate for working those switches and pots regularly just to keep them working
I can't believe I gave one of these away when I was a teenager... I found one of these amps at a recycling facility here in Denmark, and took it home on the back of my bike. Sound in both channels, It still had the square cover and all it's switches. Took it with me to be semi permanently used for playing music at a frequently youth assembly location. My dumbass gave it away to another teen because I was to lazy to carry it home after the assemblies were over and done for...
I have this amp and it's not working at all. It has power but I get no signal coming through. So far I only had a quick look at it, however, so I will finish watching this clip and see if it is of use in my case.
hola excelente video,tengo un amplificador victor modelo ja-s41 el problema de este amplificador es que enciende y el reelé se desconecta a los segundo y está así todo el tiempo no sé cual será el problema seria una gran ayuda suya saludo cordiales
Have this amp as well, and had it serviced awhile back here locally in Ohio for the same issue - that is no sound out of one channel. Now I'm getting some occasional static, thumps and hum. Had anyone else had this issue, and if so, what worked to resolve it?
I need one of those flip switch knobs for the same amp. Any chance someone knows where to get one?
Hi!
I need switches for one of these. Amp is working but switches ends their life... May by someone can help???
Dilemma: you never know what value a cap had when installed. For me a 470 µF cap that measures 468 is most likely bad. These often go for 10% or more above rating when new, so my guess is that it has already lost 10% and steadily on its way out.
CHANGE ALL THE CAPACITORS
I did
Why did I read that with a Dalek voice? ;D
@@C64SX "You - will - change - all - cap-acit-ors - or - you - will - be - ex-term-inated!" 🤣