Fender Twin Reverb amplifiers use four output tubes, of the 6L6GC type. They use six preamp tubes, consisting of four 7025/12AX7 types and two 12AT7 types.
Fender Twin Reverb amplifiers employ four output tubes, of the 6L6GC type. They utilize six preamp tubes, comprising four 7025/12AX7 types and two 12AT7 types.