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Careful here, Schanz, if the voltages you reported are right, you are pulling way too much current from the 80 rectifier and power transformer. The field coil shoud get warm over a hour or so, but you say the field coil on the back of the speaker becomes hot, this confirms overload.
Just to start, with the radio unplugged, what's the resistance reading between the 80 filament (doesn't really matter which one of the two) and the chassis? With the symptoms you describe, I would expect a very low resistance, if this is the case, this is not right. Check C26, C28, the primary of the OPT and the 42 tube for shorts to chassis, or, failing these checks, the wiring carrying the B+ voltages around in the radio. Avoid as much as possible to plug in and turn on the radio, as this may cost you another power transformer / 80 tube / field coil! Oh, BTW, I hope that 6VAC on the 80's filament is a mistypo, as this would ruin the tube in a short time
Just let me know if I can help you further
Giulio
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