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Original Message
RE: New Tubes (6CA7)--now bias too high
Posted by petercapo on February 11, 2016 at 14:15:10:
Not something I have delved into for tubes having this issue. However, if you were to somehow make adjustments to the circuit in order to bias the 6CA7s, you might not then be able to bias your other EL34s. Not sure if there is a way to have a wide enough biasing range to accommodate all of them. Don't know if Joe's bias expansion mod or his bias control module can do it or not.