Mesa DC-3 bias too hot

[rockon1]

Heres a picture of the 2M2 resistors (I believe) as one side goes to pin two. Bob

[Pedro Vecino]

Lift one end and connect in series another 2M2 resistor. The negative voltage rises with it.
After, fine-tuning is required. Depending on the degree of the tubes may need to raise the final value.

[GainFreak]

Or assemble the tested and working circuit I posted above on a small PCB and you'll have real bias adjustment.

[rockon1]

Well I decided to bump down the 120k . Got 13.7 on pin 2 now. The PI bias barely moved. If I was to do it nicely I'd put a 76k and 50 k pot in place of the 120k and perhaps a 20k pot in place of the 15k Pi bias resistor. Bob