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Re: crackle!!

Tarbaby, hi. Don't get too bummed out about it. Your amp looks like it uses 1 12AX7 ( one section for each channel) and two 12AU7 as phase splitters. Yeah, if you haven't done try changing out the input tube. Have you tried OS or NOS tubes in these positions? Your amp uses some kind of auto biasing scheme. If this is an active bias set circuit (adjust negative voltage on output tube grids for a pre set amount of cathode current automatically) I could see this as a source of problems. Have you talked with anyone at the factory? A tech who knows your amp backwards and forwards may offer big help.


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