10-25-2022, 08:06 PM
>Around 1232 tube, measured 182V (160V schematic) and 179V (105V schematic).
Ok Those are a bit high. The 182v tell us that #13 is working. If it wasn't you would have 0 volts there. Having both the plate & screen grid voltages high means that the tube isn't drawing much of any current. So need to look at #7 the 390 ohm resistor. Also check the ground connection. They can get oxidized a not make a complete connection. The pins on the loctal tubes oxidized and can make poor connection. Or could be a weak tube.
So folks don't care to work on the '39-'42 Philco as that use rubber coated wire (US sets) and Loctal tubes.
Ok Those are a bit high. The 182v tell us that #13 is working. If it wasn't you would have 0 volts there. Having both the plate & screen grid voltages high means that the tube isn't drawing much of any current. So need to look at #7 the 390 ohm resistor. Also check the ground connection. They can get oxidized a not make a complete connection. The pins on the loctal tubes oxidized and can make poor connection. Or could be a weak tube.
So folks don't care to work on the '39-'42 Philco as that use rubber coated wire (US sets) and Loctal tubes.
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
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