> Sylvain asked:
> >Lights up fine (fixed the dead PSU) But there's only a very bright dot in the center
> >of the tube. Focus, Brightness don't change a thing, still very bright dot.
> Sounds like a low-voltage power supply failure, maybe even a fuse.
> 73, Alan
Boy you're good. I went back to the bench this morning. I replaced a blown 7812 taht
I thought was good but still the same problem...then I dusted
my logic probe and took a few "readings", to find a burnt trace in the 55V circuit.
Works like new ! Hey, I got myself a 100Mhz Leader scope (3 traces) for 20$ !
Not an old radio...but I really needed a good 'scope.
Thanks to all responding privately to my request. Lou and Terry for directing me
to "sci.electronics.repair" (I couldn't find the right ng for that, thanks guys!)
and John Bartley for making available a pdf of a similar scope.
made in Quebec