The 5 inch cooling fan: needed to keep the 8 x 6550 output bottles cool! (or KT88’s).
There were a few faults needing attention on this baby; mainly the duff output transformer!
Note two of the “Luca (spade) connectors” (W31 & W32) ripped out of the board with over tightening the cable-ties!
Along with the duff output transformer & a couple
of other small issues, I replaced just two kaput 6550’s,
re-biased the whole amp, and whoo…….away she
The thermal “cut-out” protection switch, mounted on the back panel. Yet another sensible and essential feature for an amp like this!