Bottlehead Kits > Crack-a-two-a

Lost sound in the right channel [resolved]

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TheRedMantra:
I totally left the tester headphones plugged in. Measurements are to spec! I was still having intermittent sound in the right channel. After redoing the connections to the pots I pressed the center lower terminal of the volume pot with a chopstick the sound was perfect. When I released it the sound cut out of the right channel. Same with the furthest lower terminal closest to the tubes; but when I pressed that one I also saw the center terminal flex. I bent them down very slightly toward the chassis plate and now the sound is clear in both channels. I can tap them and not lose sound or hear buzzing. But now the channel balance doesn’t do anything.

If bending those terminals helped what could have been or still might be wrong?

Paul Birkeland:
I think this is a rare instance where you can put in the attenuator upgrade and roll the dice on that one.  If you want to be ultra sure, you can solder the middle lug of each level of the volume pot together with a jumper wire to put the amp in mono, and that will confirm that everything after the attenuator is working happily.

TheRedMantra:
I installed the attenuator upgrade today and the amp is back to being happy. I wonder why all that happened but it was good motivation to upgrade. Paul, thank you for being so responsive and helpful.

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