[MrFixr55]

BINGO!! NOW IT ALL MAKES SENSE!! SUCCESS! A Pic is worth 1K words!!

Hi Hamilton,

Thanks for the great pix! They are the telling of the story!!

OK, the reading between Pins 3 and 4 is not 0 Ohms, it is "OL" KOhms, a resistance higher than the meter is capable of reading. It is infinite ohms. In other words, one leg of the transformer is open. The transformer is bad. With the speaker unplugged, and radio powered off and unplugged, if you got the same reading between pin 2 of one output tube and pin 2 of the other, this is normal. So, a dead short in the transformer and a dead short (0 Ohm) between the 2 output tube plates with the speaker plug unplugged would be rare, But "OL" between the 2 pi 2s and between 3 and 4 on the speaker is explainable as a single event. The transformer primarytcoil "opened".

In the current condition, the radio will play, but not as well as it would with the transformer fully functional. It may be bad for the tube reading only 38V also.

Looking at the side view of the transformer, showing connection 3 and 4 and the secondary, the burn mark may indicate where the transformer burned out and the wiring may be repairable. However, this is a gamble. You have to peel away the paper wrapping. this may totally ruin the transformer, however.

Next step is to figure out the correct replacement transformer. I will defer to the experts, Ron Ramirez, terry (Radio Roslyn), etc. Primary impedance of the transformer (This is very different from resistance, although still measured in Ohms) is 8K Ohms Plate to Plate per RCA receiving tube Manual or 10K Ohms per a Tung Sol Spec Sheet. The issue is the speaker voice coil impedance. the resistance is 1.1 Ohm. If the impedance is 4 or 8 Ohm, then a transformer will be easy to find. If the impedance is much less than 3 Ohms, it may get interesting. Experts on this Phorum can suggest a replacement.

Again, great work for an electronics newbie, tour persistence, good work and good pix paid off! And a wonderful job on the cabinet! Any Museum would love to have your radio (But museums being non-profit, they wouldn't pay for it. Don't part with this, this is your trophy!!

Get a new transformer, add a radio phono switch and this radio will be a really great performer. It would be a nice sounding amp for guitar, but you would not be able to overdrive it without a preamp. The rating for this configuration of 42 tubes in class AB Push Pull is 15Watts!! (Per RCA and Tung Sol specs for triode 42 driver and triode P-P 42 outputs being fed by 350V B+ on the output tubes).