Ringing in right channel with overtones

[Paul Birkeland]

Middle lug on each level of the volume pot half volume
R: .117
L: .116

With the volume pot part way up, these AC voltages should be less than what you have at the center pins.

Half Volume:
Terminal 6: .254
Terminal 10: .164

Did you try a spare 12AU7?  If your DC voltage checks pass, this is almost certainly a soldering issue somewhere in the amp.

 

[Nignoog]

Thanks for your prompt response. The support here is truly incredible.

I measured the AC voltages on the pins that are directly connected to the RCA connections (far left if the RCA connection is closest to you). I will remeasure the AC voltages on the top and bottom center pins and post those.

I will try another 12AU7 and see what the voltages are for Terminal 6 and 10. If they are the same or comparable, any suggestions where to start with the soldering? Which terminal is closest to the desirable number range? Is terminal 6 too high or is terminal 10 too low? Should I just follow the wires that go from the RCA and reflow everything they touch?

 

[Paul Birkeland]

I would honestly just reflow them all.  It also wouldn't hurt to post your DC voltages on terminals 1, 2, 4, 5, 7, and 9.

-PB