Hello, I am working on a pair of Stromberg AP-50 amplifiers, and they have no bias or balance adjustments, which I would like to implement. I have modified the original schematic and posted it here. Im seeking advice on what value potentiometers and resistors to use, and if I am heading in the right direction.
For the balance setup, I was planning to use a 100k pot, with two 100k resistors to ground, and changing the value of R21+R22 from 100k to 47k. Will this work okay?
For the bias I am not sure how to do it correctly, I did make a revision on the schematic that includes a bias pot and resistor to ground, but dont know if this is correct, or what values I should use.
The revisions on the modified schematic are in red.
Modified schematic: https://s33.postimg.cc/b6d6akd5b/Stromberg_AP-50_Schematic_Modification_2.jpg
Original schematic: https://s33.postimg.cc/y93p9fotr/st50.jpg
Thanks!
For the balance setup, I was planning to use a 100k pot, with two 100k resistors to ground, and changing the value of R21+R22 from 100k to 47k. Will this work okay?
For the bias I am not sure how to do it correctly, I did make a revision on the schematic that includes a bias pot and resistor to ground, but dont know if this is correct, or what values I should use.
The revisions on the modified schematic are in red.
Modified schematic: https://s33.postimg.cc/b6d6akd5b/Stromberg_AP-50_Schematic_Modification_2.jpg
Original schematic: https://s33.postimg.cc/y93p9fotr/st50.jpg
Thanks!