Have you tried calling ARC's service department?
BillWojo
BillWojo
Setting bias on a vintage ARC
I have some new matched KT 90 tubes ARC V35 amp.
im setting the bias, but I’m a bit confused. One channel can be set to the 37.5 mVDC, But when I check the other channel, I get 34.00 mVDC.
Where I get confused is there is only one pot, so does turning the pot clockwise or anti clockwise shift the balance to get the same number between the two sides OR does turning it one way or the other raise or lower both sides equally, and if so how should I adjust the the bias setting?
btw the recommended setting is 37.5 mVDC.
im setting the bias, but I’m a bit confused. One channel can be set to the 37.5 mVDC, But when I check the other channel, I get 34.00 mVDC.
Where I get confused is there is only one pot, so does turning the pot clockwise or anti clockwise shift the balance to get the same number between the two sides OR does turning it one way or the other raise or lower both sides equally, and if so how should I adjust the the bias setting?
btw the recommended setting is 37.5 mVDC.