Red Plating Power Tubes Fix - 1966 Fender Blackface Bassman

In this video, we'll find out how to spot red plating 6L6GC output tubes in a modified 1966 Fender Blackface AA165 Bassman Head. This amp was purchased on Reverb.com and damaged in shipping, so this evaluation is for warranty purposes. We will determine if it's just a tube issue or something in the circuit. We will also see what sort of problems a microphonic preamp tube can cause. And we will generally explore the guts of a typical Blackface Bassman.