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Philco mod. 20
#2

Ok I give up what did it come out of??
Or is there a part # starting with a K or a S inked on it's frame?

The general answer is not so much. It needs to meet a few criteria. Low impedance output transformer to match the push pull triode output tubes (about 4000 ohm total). Needs to have a push pull output transformer. A speaker from a model 70 looks the same but has a single ended transformer. The field coil needs to have a fairly high dc resistance about 3100 ohms. Most of the later sets the field coils are lower around 1500 ohms.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry


Messages In This Thread
Philco mod. 20 - by Gary T. Lane - 09-26-2020, 01:30 PM
RE: Philco mod. 20 - by Radioroslyn - 09-26-2020, 03:52 PM
RE: Philco mod. 20 - by morzh - 09-26-2020, 05:21 PM
RE: Philco mod. 20 - by radiohenry - 09-26-2020, 05:33 PM
RE: Philco mod. 20 - by radiohenry - 09-26-2020, 05:38 PM
RE: Philco mod. 20 - by morzh - 09-26-2020, 07:31 PM
RE: Philco mod. 20 - by Gary T. Lane - 09-27-2020, 09:39 AM
RE: Philco mod. 20 - by Radioroslyn - 09-27-2020, 11:19 AM
RE: Philco mod. 20 - by Gary T. Lane - 09-27-2020, 12:08 PM
RE: Philco mod. 20 - by Radioroslyn - 09-27-2020, 03:30 PM
RE: Philco mod. 20 - by Gary T. Lane - 09-27-2020, 04:35 PM
RE: Philco mod. 20 - by radiohenry - 09-28-2020, 10:57 AM
RE: Philco mod. 20 - by TA Forbes - 10-29-2020, 07:44 PM
RE: Philco mod. 20 - by morzh - 10-29-2020, 07:48 PM
RE: Philco mod. 20 - by MrFixr55 - 11-26-2020, 11:08 PM
RE: Philco mod. 20 - by morzh - 11-26-2020, 11:15 PM



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