Oh, wow.. They used brown glue to hold the relays in place before soldering them. It's the same glue that was used in a lot of 70's equipment, typically around bigger capacitors and small heatsinks. It oxidizes over time and becomes conductive/corrosive, hence the rusty look. I've heard that acetone loosens it up better than alcohol, but haven't tried it yet.
Hello great video: I am wondering if you or any other viewers have any info on the Proton AA2120? I recently acquired one and it appears one channel is dead, it looks exactly like the AA1150 which I assume they different power ratings or something. I routinely repair AVRs, Plate amps, amps, etc...and would like to know if anyone can guide me on common issues or where to obtain a service manual. I would appreciate any input anyone could provide, thanks in advance!
Oh, wow.. They used brown glue to hold the relays in place before soldering them. It's the same glue that was used in a lot of 70's equipment, typically around bigger capacitors and small heatsinks. It oxidizes over time and becomes conductive/corrosive, hence the rusty look. I've heard that acetone loosens it up better than alcohol, but haven't tried it yet.
Use of that stuff was unfortunate.
Hello great video: I am wondering if you or any other viewers have any info on the Proton AA2120? I recently acquired one and it appears one channel is dead, it looks exactly like the AA1150 which I assume they different power ratings or something. I routinely repair AVRs, Plate amps, amps, etc...and would like to know if anyone can guide me on common issues or where to obtain a service manual. I would appreciate any input anyone could provide, thanks in advance!
Unfortunately I do not.
@@millervintagehifi3034 Appreciate the reply sir.