1966 Bassman

AB165 circuit that had been previously modified to use EL34s.  Long ago, another tech had removed the bias balance control and performed some strange but minor circuit mods.

I undid most of the previous modifications, converted the weird AB165 feedback circuit to the AA864 specs, and modified the normal channel tone stack for a better guitar tone.  I also paralleled the two triodes in the channel mixer stage, since there was an extra triode sitting there unused.  The amp also needed some general maintenance and minor repair work.  

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