[VT FUSE]

Circuit is part of a whole manual at Crypto Museum,easily found-not sure about putting circuits etc on this forum hence chose not to supply a link.
The BFO architecture is discussed and also mention of the operator controls.
The receiver is fed by a gas regulator valve so earlier comment on mains fluctuation is a red herring on my part (not the 1st time one gone u/s however)
May even be down to oxidised wire lead outs on the cv466,the diddy B8D sockets comprise very basic metal type and thus could be suspect after many years-could be worth a drizzle of contact cleaner on a cotton tip maybe? surprised that they are not silver plated.
The voltages around cv466 do look very unusual!
Mike