First post here, I am learning from you guys as I am a total newbie seeking help here. I have a Scott 200b that has good tested tubes but I can hardly hear the right channel. Plugging my CD player into the Tuner inputs I can only get anything out of the right if the left is plugged in and it is not stereo only mono. The right preamp adjustments, bass and treble don't work in any case at all. As soon as I unplug the left rca it's almost silent unless I turn it up to 10. Plug it back in and the right comes back on at a reasonable volume. I cleaned the selector switch with Deox it. Any suggestions would be appreciated. I also wanted to add that the bias adjustments don't work either.
Thanks
Thanks
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"Plug it back in and the right comes on at a reasonable volume"
Sounds like a HR (high resistance ) soldered joint possibly at the output as heat makes the connection, otherwise a break in the PCB somewhere.
Sounds like a HR (high resistance ) soldered joint possibly at the output as heat makes the connection, otherwise a break in the PCB somewhere.
This integrated amp is point to point soldered duncan2, it could be a solder joint though. It has been recapped entirely, even the cans. I have been tracing wires with my MM with no luck. But like I said I am only trying to learn.
Start signal tracing, input a mono test signal to both channels, and trace it through
each stage from the input jack with a scope. At some point it will only be in one channel.
http://hhscott.com/pdf/fs/200-C1.JPG
each stage from the input jack with a scope. At some point it will only be in one channel.
http://hhscott.com/pdf/fs/200-C1.JPG
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It appears that the problem is prior to the input to the power amplifier.
Only check points outside of feedback loops for now.
Only check points outside of feedback loops for now.