[Arran]

Thanks Glenn! I've got all the NA Riders paperwork and my own original Beitman schematics. All showing the 7J7. I know the 5Y3 isn't correct and why it was changed I don't know. 84 has a 5 pin socket and it was changes to a standard octal to support the 5Y3. Okay to run the 5Y3 but not with an aftermarket power transformer that's rated 250-0-250 on the hi-voltage outputs. If my memory serves me well the 5Y3 wants plate voltage of 350-0-350 for the hi-voltage. The transformer that's on it now has a big puddle of wax under it so I know it got very hot. Haven't checked winding resistance yet. Puddle of wax could have been from the original transformer. Just gettin' started on it and wanted to figure out this 7J7 issue 1st. A couple of resistors coming off of the 6J8 are color coded grn. stripe with brown body but they don't read anything with a "5" at the beginning. In fact they both read completely different by hundreds of ohms.

I'll get in touch with Chuck. His paperwork is always great.

Thanks again,
Pepper

A 5Y3 doesn't care whether it has 250 volts on the plates or 350 volts on each plate the only thing that matters is what the current load is on the output of the tube, in the case of a 5Y3,5Y5, and an 80 the maximum current is 125 milliamps. Quite clearly the original transformer packed it in and someone could not find, or could not bother to find a duplicate of the original. If the original was a type 84 the filament voltage is 6.3 volts and is normally powered from same filament winding as the rest of the tubes, unlike the 84 the 5Y3 does not have an indirectly heated cathode so it needs it's own 5 volt filament winding. The filament current of a 5Y3 is 1.5 amps, which is pretty standard, so if the new transformer has a 5 volt winding it should be able to take that tube. If the transformer is running hot it may be that either the high volatge winding or the 6.3 volt filament winding cannot handle the current load of an eight tube set with push pull type 41s.
Regards
Arran