Revox A77 project
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[Deleted User]
Posts: 7,658
Hello,
I thought I'd share some photos of a classic Revox A77 deck that I've been working on. I've taken it completely apart and cleaned and polished everything I possibly can. All of the resistors and caps in the record/playback circuit have been replaced as well as PS caps and motor snubbing caps. I've replaced the internal wiring with Cardas balanced cable and added to the AC hum shielding. Both of the tape transport bearings are replaced. The last two photos are of the record/playback frequency response for each channel using SM911, each vertical division is 2dB and the frequency is across the bottom. Not bad for a 30+ year old deck.
Cheers, Ken
I thought I'd share some photos of a classic Revox A77 deck that I've been working on. I've taken it completely apart and cleaned and polished everything I possibly can. All of the resistors and caps in the record/playback circuit have been replaced as well as PS caps and motor snubbing caps. I've replaced the internal wiring with Cardas balanced cable and added to the AC hum shielding. Both of the tape transport bearings are replaced. The last two photos are of the record/playback frequency response for each channel using SM911, each vertical division is 2dB and the frequency is across the bottom. Not bad for a 30+ year old deck.
Cheers, Ken
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Comments
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As always, NICE!Vinyl, the final frontier...
Avantgarde horns, 300b tubes, thats the kinda crap I want...
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As soon as I saw "Revox" I knew this was a Ken post. Awesome as always Ken.Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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Thanks, guys!
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Nice work, Ken. How long did that job take?Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
That one took about 9 months, on and off. I think the next one I'll try using good quality electrolytic caps instead of the film type. It takes so much effort to get them on the boards. But, I have some replacement transistors and a separate audio PS on hand to try. Plus I think I'll have the overall frame pieces powder coated to see how that looks.
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You can't rush good work.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Excellent work. You have great talent working in a cramped chassis like that. I bet it sounds superb.
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Does the rebuild include a healthy dose of that "Baltimore Basement" air, I hear it has magical qualities. Nice work Ken. :cheesygrin:
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Ah yes, plenty of Baltimore Basement air involved!
One of the things I think I need is an ultrasonic cleaner of some kind. Now I spend a lot of time individually polishing screws, bolts and other small pieces. If anyone can recommend a good approach I'd appreciate it. I clean the leads on resistors and capacitors before soldering, I don't think I'll try ultrasound on the caps, but perhaps the resistors? I've read about units that vary the sound frequency so they can be used on filled circuit boards without damaging parts. I don't know if I want to get that involved (which I easily tend to do).
Anyone have experience in this kind of thing?
Cheers, Ken
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