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Pioneer SA 600 slight static one Chanel

Gaspar74

Gaspar74

Active Member
Howdy. I recently acquired a Pioneer Sa600 which was pulled literally from a grandmothers home and has had little hours on it. It looks exceptional. Upon firing it up it was apparent that all the dials amd switches had oxidized as it sounds def horrible all the things you’d expect from a almost 50 year old amp that’s been sitting. Internally it was spotless and all components look new still. I cleaned all switches and pots with D5 and she fires up and was sounding great. Long story short second day using it I noticed slight static from just right Chanel only audible up very close to speaker with ear real close. Left Chanel is silent static wise. This happens with no source plugged in at zero volume etc. is this a great cause for concern? Without having a scope but do have a meter as well a soldering iron what should be my Next steps. If this has been answered 1k times I apologize. I’m pretty mew here amd search query didn’t yield me good results.
Thanks
 
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Got a Service Manual? With that, a DMM and a soldering iron you can pretty much get help figuring it out.
First guess, an old transistor getting noisy. Could, probably, use a refurbishment, replace old electrolytic caps and transistors.
I do not see any previous threads on SA-600 rebuild or repair here, so you might be the first to deep dive into one an AK.
In that case you would need to make a list of electrolytic caps and transistors by looking at the SM and schematic, to start building a Bill of Materials (BOM).
Then the fun begins, matching old component with new replacements. The old transistors are long out of production.
And Welcome!!
 
I’ve got the service manual and am working on a parts list. This uses the 2sc793 toshiba transistors in the output stage 4 and then there’s 6 2sa497’s

I found a list here of modern replacements. Should I just go ahead and do them all ya think? Also for caps. I’m assuming I should get elctrolytic replacements. I’d like to get the best possible ones for it. Where’s the best place to get audio grade components and which brand really? Nichicon Elna Panasonic?
Thanks in advance.
 
Many of the AKers buy from Mouser.com. They are a reliable vendor authorized as a reseller for many top brands.
Cap replacements are usually like for like type, except many will replace small electrolytics in the signal path with film caps. The 4.7µF and 10µF film caps can be a bit bulky, but the lower capacitance ones usually are a drop in replacement for size. Verify lead spacing to be sure. Increasing the voltage is often done and does not create a problem.
I like to do a thorough job for refurbishment projects, after the initial problem is fixed. If you start replacing parts without repairing it first you risk adding problems and making it harder to fix. So I do a bit of troubleshooting first, if necessary, then order parts. That being said, a crackly or noisy transistor may be cleared up by a refurbishment.
Replace a few parts on one board at a time, test for function. If your replacements are done correctly it should come back up OK. If not, you have a small area and just a few components to reexamine.
On my SX-1050 I replaced all the transistors and electrolytic caps on the audio boards, the power supply and the protection board. I will not do the tuner, though some do.
 
merlynski said:
Many of the AKers buy from Mouser.com. They are a reliable vendor authorized as a reseller for many top brands.
Cap replacements are usually like for like type, except many will replace small electrolytics in the signal path with film caps. The 4.7µF and 10µF film caps can be a bit bulky, but the lower capacitance ones usually are a drop in replacement for size. Verify lead spacing to be sure. Increasing the voltage is often done and does not create a problem.
I like to do a thorough job for refurbishment projects, after the initial problem is fixed. If you start replacing parts without repairing it first you risk adding problems and making it harder to fix. So I do a bit of troubleshooting first, if necessary, then order parts. That being said, a crackly or noisy transistor may be cleared up by a refurbishment.
Replace a few parts on one board at a time, test for function. If your replacements are done correctly it should come back up OK. If not, you have a small area and just a few components to reexamine.
On my SX-1050 I replaced all the transistors and electrolytic caps on the audio boards, the power supply and the protection board. I will not do the tuner, though some do.
Click to expand...
Ty. That’s exactly where I ordered from. Bought all replacement transistors on the amp board except the main output ones. Also all need caps on that board and the power supply board. I kept the original filter caps for now. I should get parts this week amd will be diving into it. I’ll update as I go. This will be my first refurb/repair aside from swapping g out some speaker relays on a couple amps. Thanks for feedback.
 
Does anybody have BOM list for Technics SA-600?
I have not seen it here while searching.
Thanks
 
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