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RE: Need some guidance on my new M400-s mono amps

Thank you for your response. I will definitely look into the eBook you suggested. Sounds like a good launching point for me to get acquainted.

Bias test and set on these amps is pretty simple for me and have done the stock 34s as well as the upgraded 34s in now. Manual states .40 and that is where I dialed both sets into.

I assume changing out the 6922 or12au7 would mandate a bias check on output tubes?



Edits: 06/24/21

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