Bypassing Revox A77 volume and balance pots

[Pano]

the pots in all these decks are so old and of not high quality

Even back in the 1980s, every A77 that I owned or used suffered from poor contacts and noise in the pots. I replaced every trim pot in there. Good luck with your bypass, it should make a nice difference.

I didn't know about DeOxit fader lube back then. Now I always have a can handy.

 

[mateusfig]

I gather for the balance, you placed a 13K resistor between red and orange and a second one between orange and brown wires on channel I and between yellow and blue and blue and green wires for channel II. Did I read this correctly? Also, did you remove the wires from the pots (I would think you did but you didn't mention as otherwise you'd have parallel resistors)? I have "cleaned and lubed" the pots but haven't tried them yet and am anticipating not wonderful results but I am looking to your solution if it doesn't. Since I only use this for occassional playback, I am not worried about the record volume pots but I might have to do the playback volume. And you are right about basically just looking at the balance pot and it crackles! 🙂

Thanks!

@giaspyr could you confirm this question of @TheBobit? I dont have same doubts.

 

[mateusfig]

Sorry, I meant: "I DO have same doubts"