Is this the correct way to solve the problem? If so what value resistors should be used?
I just rebuilt my ST70. Replaced - the Quad cap (with upgrade), Bias circuit (including diode), all octal tube sockets, and added a Bias Balance Control - all from DynakitParts.com.
With the Bias pots all the way counter clockwise I get 1.25 Vdc at each of the four test points. (Using a new set of matched tubes.) The readings should be set to 0.40 to 0.50 with 10 ohm bias resisters.
Thanks for any advice.