The manual states to bias the stock (Shuguang) KT-88's at 350ma. I've got a quad of Tung-Sol 6550's (New Sensor reissues) to install - anyone have an idea as to what I should bias these at?
Don't forget to turn the bias pot all the way down before you put in the new tubes. Once the tubes are inserted, bring the bias up slowly to the desired level.
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