thanks, but i will need to repeat part of the work and add more work to restore it for good.
the hint by Leo about a missing ground at the output was right!
at now, with the RCA output attached to my amp for listening, i added also the second cable from the amp to the RCA inputs, then providing the ground also to the output.
this way, both channels finally arrived and in phase, then this is definitely a matter of ground.
anyways, the sound is a bit weak and quite distorted/unclean, both in source mode and in play mode, then at least all the electrolytic capacitors need to GO!
That's an amazing restoration job, Vince. Can't wait to see it completed. Appreciate you taking us along on the journey; I have once again confirmed that Nakdoc has been a very good friend to me over the years.
Yes; I don’t like the look of the one just to the left of the “R” and also due north of the obvious one.
Seriously- if you have the boards out anyway, check each connection with a 10x loupe and reflow any suspect ones (after a washing and scrubbing with electrical cleaner and toothbrush). I’m more mechanical than electrical but bad mechanical joints are no good for electrical…
when I started disassembling switches for the first time, like very few years ago, I never looked back.
yes, it's a lot more work but wow.... they return just like new.
and especially on the older decks, many of them are just into the signal path.
I need to start doing the same. I assume, disassemble, clean with a Q -tip and alcohol, grease with Deoxit grease, reassemble. Do you do anything special with the contacts? Kind of concerned about alcohol on plastic or graphite/carbon resistance strips or rings. From your experience, what's best practice?
I noticed that, to clean those very dirty contacts, the rubber eraser (like the one you can see there in a couple pics) is the fastest and easiest way to clean them.
but, yes, i use alcohol quite extensively while cleaning.
you have done an admirable job!!!...but...the Giovedi-push-button-switches...
You cleaned the contact-sliders, yet not the pins/legs! The housing can, I presume (Revox B750 Schadow switches), be taken apart to give you acces to the "legs".
Regarding the rubber-eraser...are you fond/in possession of a mechanical/analog typewriter?