[morzh]

OK, resurrecting the thread.

First of, power switch is flaky a bit, opened, put Deoxit in, no direct access to contacts unfortunately.

Now, it seems that certain someone changed the pilot lamp socket and in doing so connected one of the contacts to chassis. The probem with that is that the lamp now parallels the filaments, and not in series with them.
I got suspicious when I saw 145 Ohms load to the Mains, and pulling tubes did not affect it.
Nash git!

Well, enough for today, where's my Johnny Walker double black.