Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

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RE: Revox A50

Posted by Marantzguy on March 15, 2011 at 11:27:43:
Hello, Alex:

It helps to describe what the A-50 actually is.

I assume that it is an integrated solid-state amplifier.

Your problem could be ANYTHING, but I encourage you to open it up, if you have not already done so, and assuming that construction may be based upon individual circuit cards for the various parts of the electronics, to swap them, channel-to-channel to see if the problem also moves accordingly and then try to isolate the issue from there.

And, if the construction is based upon carded circuits on removable boards, to clean the contacts in the sockets and also clean the edge contact points with DeOxiT or Caig Gold and reinsert to see if things change.

Any piece of electronics which is as old as I assume this product may be, probably also needs to have the majority of its original capacitors changed, along with general cleaning here or there.

Again, have you searched online to see if there is a print on the circuitry?

That also is essential in any sort of attempt to repair such an item.

I once owned an A-50 amplifier, but that was over twenty years ago and got it cheaply from a local police auction here in Berkeley. I was not particularly impressed with it, either. I would get in there and test voltages against a published schematic and then replace handfuls of old failing and unreliable capacitors. They do not last forever.

The ReVox A-77 and B-77's are comparatively easy to work on, though.

Same era, obviously.

Best of luck!

Richard Links
Berkeley, CA