Greetings All!
I just finished a recap on this very nice vintage receiver and all appears to work well except...
I get a sizable pop out of the speakers when the protection relay kicks in and when it clicks off. The volume pot has no affect.
The recap was done to the entire amp board and anywhere I could reach that didn't require the chassis to be disassembled. The filter caps were left alone and the power supply board has no other caps. The amplifier coupling caps were replaced with Wimas.
Like I said, other than the pop on/off everything else appears normal. DC offset is reasonable ~ 20mv. I can provide images of the manual if you like.
I did run this inquiry by the folks at AK but didn't get a solution.
Best Regards,
Mike
I just finished a recap on this very nice vintage receiver and all appears to work well except...
I get a sizable pop out of the speakers when the protection relay kicks in and when it clicks off. The volume pot has no affect.
The recap was done to the entire amp board and anywhere I could reach that didn't require the chassis to be disassembled. The filter caps were left alone and the power supply board has no other caps. The amplifier coupling caps were replaced with Wimas.
Like I said, other than the pop on/off everything else appears normal. DC offset is reasonable ~ 20mv. I can provide images of the manual if you like.
I did run this inquiry by the folks at AK but didn't get a solution.
Best Regards,
Mike
Over on the right hand side under the heading 'Stereo Beacon' I can see a couple of open relay contacts to ground. Could the source the the thumping be dirty relay contacts that don't properly drain the energy in the system to ground on startup/shutdown?