Bottlehead Kits > Mainline

Need some help fixing a faint hum

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MikeSattler:
Finished up my mainline kit the other day and it sounds excellent except for a very faint hum. It sounds more similar to 120hz than 60 hz and it's not affected by the volume or any of the front panel switches. So far I've tried a few things to no avail. Moved it to a different room, tightened up the transformer, reflowed the solder for as many of the ground points as I could find, and cleaned the tube pins. Voltage and resistance checks are spot on. What should I try next?

Doc B.:
Is it the same level in both channels?

MikeSattler:
Yep, right in the center of the image.

Also forgot to mention - I replaced the buss wire with the ground breaker diode mod and tried a cheater plug to lift the ground connection.

Paul Birkeland:
Can you tell us more about the source you have hooked up to it?

MikeSattler:
Seems unaffected by having anything plugged into the RCAs. When I moved it to another room I just plugged the amp straight into the wall with nothing else hooked up to it and it’s still there.

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