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Revox A77 small trimpots replacement

69.108.138.138
Posted on October 18, 2009 at 02:56:17
pepericoz
Audiophile

Posts: 32
Location: So.Cal
Joined: July 28, 2008
 Looking for a replacement trimpot for my revox a77 (20k ohm) I think piher has some, anyone know the part number?Thank you.

RE: Revox A77 small trimpots replacement, posted on October 21, 2009 at 11:58:31
Marantzguy
Audiophile

Posts: 2411
Joined: June 21, 2002
 Hi, perericoz:

Digikey or Mouser are good resources. Try looking for something manufactured by Bourns, for example.

Keep your soldering pencil at moderate (not high) temperature when removing and reinstalling these, however, otherwise, the traces may lift off the circuit cards in your A-77.

Good luck!
Richard Links

RE: Revox A77 small trimpots replacement, posted on October 21, 2009 at 13:39:15
pepericoz
Audiophile

Posts: 32
Location: So.Cal
Joined: July 28, 2008
 Thank you Richard,i'll check those bourn trimpots out,i think piher has some trimpots that identical to the original revox trimpot (size and value)i read a post that they used piher and even listed out piher part number, but i couldnt locate or find that post again.....Anayways, i have read your post regarding your revox a77,have you completely overhauled your unit?i did with mine,replacing all lytic caps,cleaned all pots and switches,calibrated head and electronics with MRL tape,oh man, this is one heck of a machine, it sounds very musical.I read an article about the revox a77,this article was written in the 70s for an audio magazine over in europe, the guy suggested that, reducing the gain on the repro card, the factory gain setting or suggested in the manual is too high,if you can set it down to 0db (.775mv or even 1v) it is better,it cut down the hissing sound and noise.i used mrl tape 250nwb/m NAB to set the machine.The output volume control must be all the way up (clockwise postition) when adjusting the repro trimpots.Don't forget to readjust the record level trimpots on record card when changes are made on the repro cards.

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