A friend of mine asked me to have a look at his Sansui au-607 saying it starts to get noisy after listening for a while. If he turns the volume knob it apparently clears up, until it needs another turn.
Opening it up today for a first time look the interior is typically dirty . . . . dust, oils, bread crumbs, bug bits etc. also Left end of board photo shows the start of heat discoloration. The photo doesn't show most of the crud that has accumulated on the cool side of the board , especially down near the bottom.
The controls will take a bit more work to uncover but considering the dirt and age I'm wondering how far to go. I don't have experience with anything like these old Japanese SS amps and so no idea whether to stop at spraying some cleaner into the pot . . . . . or if attempting to do a better job for my friend by dismantling and cleaning this roughly 30 year old amp is wise or asking for trouble.
Any advice?
TIA
Opening it up today for a first time look the interior is typically dirty . . . . dust, oils, bread crumbs, bug bits etc. also Left end of board photo shows the start of heat discoloration. The photo doesn't show most of the crud that has accumulated on the cool side of the board , especially down near the bottom.
The controls will take a bit more work to uncover but considering the dirt and age I'm wondering how far to go. I don't have experience with anything like these old Japanese SS amps and so no idea whether to stop at spraying some cleaner into the pot . . . . . or if attempting to do a better job for my friend by dismantling and cleaning this roughly 30 year old amp is wise or asking for trouble.
Any advice?
TIA
Attachments
Vacuum it out, but avoid compressed air. Clean all controls, switches, pots with DeOxit,
but do not touch any small trim pots on the pcbs. Don't take anything apart.
"The less you use, the better it works" is their slogan.
CAIG DeoxIT D5S-6 Spray 5 oz. with Perfect Straw
Check the speaker outputs for any DC voltage present, it should be less than 0.1VDC.
Then try it out for a while on junk speakers, checking for noises, hum, smoke, etc.
Watch for erratic operation. Run it continuously for several hours during the day,
but don't leave it running unattended.
Sometimes the large power supply capacitors will leak, or the emitter resistors will fail,
but don't worry about that just yet.
but do not touch any small trim pots on the pcbs. Don't take anything apart.
"The less you use, the better it works" is their slogan.
CAIG DeoxIT D5S-6 Spray 5 oz. with Perfect Straw
Check the speaker outputs for any DC voltage present, it should be less than 0.1VDC.
Then try it out for a while on junk speakers, checking for noises, hum, smoke, etc.
Watch for erratic operation. Run it continuously for several hours during the day,
but don't leave it running unattended.
Sometimes the large power supply capacitors will leak, or the emitter resistors will fail,
but don't worry about that just yet.
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Don't stress too much about it, just see what happens, and don't
poke around inside while it's plugged in, even if it's turned off.
poke around inside while it's plugged in, even if it's turned off.
I wasn't saying it would take some time because I planned to fuss over it. It was because there are things in the queue that will only allow working on it a few minutes at a time. I did take your meaning in your first post and will follow your advice. Thanks again Rayma!