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Frustrating problem with vintage receiver, any thoughts?

post #1 of 8
Thread Starter 
I have a vintage Kenwood KR-7600, Turning the volume knob causes me to lose one or both channels, so I said no problem, I'll set it to 3/8 and control the volume with my computer. When I first turn the receiver on, sometimes the right channel won't work, but if I turn the volume all the way up on the computer and play some music, the right channel crackles then returns to normal, at which time I can turn the volume back down and it will continue to work. Any ideas on this? It doesn't make sense to me, and my neighbors are probably starting to get mad at me.

Thanks!
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post #2 of 8
My best advice?............ Go down to a local Pawn-Shop or something and just pick-up a new OR used Receiver, not worth it to deal with the hassle trying to fix that thing~ Or even check Craigslist. I myself am using a Sony a/v receiver hooked-up via Optical cable, I had a very similar problem like you so I ended up hammering the crap out of it then replacing it haha. Iam still in the market for one of those 1980s Sony Mini-Hi-fi systems, I just cant find the model I want anywhere!
     
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post #3 of 8
Thread Starter 
Haha! I was "Fonzing" this one before I figured out the cranking it trick. I understand your idea, but this was my late father's receiver, and it ROCKS, I'd like to hang onto it as long as I don't have to spend a grand to make it right.
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post #4 of 8
The volume knob itself, Can you take it off? If so I noticed with my old Receiver I took a pair of needle-nose plyers and if you pull on the metal that holds the Knob in place it sometimes fixed the problem. I totally understrand holding on to it on account it was a family members.
     
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post #5 of 8
I'd suspect the Volume pot first- try cleaning it and see if it helps at all. You may also want to consider replacing it.

Beyond that, you'll have to go signal tracing, which is really beyond the scope of this forum.

Don't listen to the other guy- this amplifier is worth quite a bit of cash and a new replacement wouldn't be cheap- a receiver like that has THD performance that most modern amplifiers can only dream of.
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post #6 of 8
If it crackles then a Transistor is starting to fail and when it come up to temperature it start to work. Try cleaning the pots and switches with contact cleaner, you can get at a Radioshack. Deoxit is the best contact cleaner. I do rebuilt them, would need full restoration being it age, capacitors replaced, resistors and other components, including drivers transistors and outputs checked and replaced as necessary. Pots and switches taken apart and contacts cleaned and bulbs replaced. Cost varies depending on condition and issues,

Receiver like that is worth fixing and go for quite a bit now. Seen that model you have go for $200 and up AS-IS and sold a fully restored one for $1200, just a year ago. Had a Technic sa-1000 that I restored, it could easily shake the walls. Sold it for over 2k at auction.
Edited by retropcdos - 10/7/13 at 10:18am
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post #7 of 8
it could be something like transistors

but It sounds like it isn't near the point of diagnosing that just yet...


get you some of this Craig DeoIT Faderlube

http://www.guitarcenter.com/CAIG-DeoxIT-FaderLube-Lubricant-5-oz--429169-i1134931.gc


see this thread

http://www.audiokarma.org/forums/showthread.php?t=207005



basically blah blah try cleaning all the pots good and likely (and hopefully) the problem will be solved.... if the problem is something more serious audiokarma has many folks that you could inquire with about trying to fix it as well.

but certainly before anything else get the contact cleaner and have a go at just cleaning the various pots on that receiver.


(nice receiver btw) I'm listening to a vintage Pioneer SX-3600 right now.
post #8 of 8
Deoxit.

Or, if you're cheap and don't want the best, just get any spray contact cleaner.
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