Known history with this , from its purchase in Germany onwards, including
its original set of valves (not in there and used now, but will test out of
curiosity). What are the main potential safety/reliability issues with an
amp of this age? All the cotton covered wiring looks good but is there some
test/procedure more convincing as to insualting value? Bakelite brittleness
in the valve bases? metallurgical failure of springiness of valve
contacts?
Someone modified to 3 core mains cable and made an earth point, for 240V
land, at some point in its history. Numerous caps replaced in 1991 and 1997
and some carbon R replaced with MO at some point. I've not checked the main
caps yet.