Andy Fuchs offers a 'mod' service where you can send in an old amp and have it rebuilt into his ODS platform. He uses the existing chassis, cabinet, and transformers - but drops in his own PCB with the ODS circuit.
This amp was at one point a 70's Silverface Fender Bassman. I go through the amp in some detail and take a look at the guts - including bias for a new set of power tubes.
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