Philco 38-4 questions

[old_coot88]

Originally Posted by darklife

You guys may not believe this but I just found a power supply transformer that has exactly the same ohms on its secondary winding and the 6.3v taps come out to be around 3 ohms so it matches the blown audio transformer.
I wired it in place of the broken transformer and IT WORKS!
Not only does it work but it sounds good too!
It is a slightly larger transformer but it mounted to the original holes on the speaker where I removed the old audio transformer and rivets.
I know it is not meant for audio usage but heck it sounds better than the original and all the voltages check out.
Sometimes luck does exist.

Yessir, a power tranny will work. Response rolls off dramatically above about 5khz, but that's still plenty adequate broadcast quality.

When i was a dumb kid and didn't know any better, i used two TV power xfmrs hooked back-to-back to plate-modulate a CW transmitter for voice. The primaries, 6.3V, and 5V windings were all in series and in-phase as shown.
It worked great.
(I didn't understand about core saturation then. The xfmrs were 25 cycle type with lots of iron, and that's probably what prevented any core saturation issues.)