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Message: <blockquote data-quote="corgan4321" data-source="post: 1010037" data-attributes="member: 37714">Thanks for your reply!Yes, it’s hooked up to pins 5 & 6 (with the little Zobel circuit still across those pins too of course) of the Carnhill output.I have the trim and the gain all the way up and I’m feeding a 1kHz tone.At full turn of the trim (volume all the way up) I’m at 22.6v on the case of the 2n3055.With the trim knob at 12 o’ clock it drops to 21.2v and with the trim all the way down it does up to 21.7v.So, the bias is changing I just don’t understand why. If I turn the gain down to where I’m not seeing any distortion on the oscilloscope, the bias doesn’t deviate: it stays at 22.6v</blockquote>