05-27-2017, 09:17 PM
Hi and welcome,
Sam's doesn't support any sets before 1946 so for any service info your going to be look at service info from the manufacturer or Rider's. Fortunitly Philco was very good about supplying tech support to their dealers. In some instances poor diagrams have been redrawn for better readability.
As for a few simple test. Unplug the large plug the goes to the speaker and measure the resistance of the 4 pins. All should show some resistance against each other below about 4000 ohms.
The other simple test is the remove the #80. With the chassis out of the cabinet remove the sheet metal bottom cover. Measure the AC at the 80 socket across the two smaller terminals Be careful there's about 700vac. Should see about 700vac there.
These tests will tell if the power transformer and speaker are ok. There are many other things to check but these are the two big things.
While you are in the gathering mode don't use electrolytic caps for the filter in the power supply. There are a couple of 2mf and 1.5mf (the ones in side the can and #43). These should be replaced with modern film capacitors @ 630v.
Before you go too far apply a little bit of oil the the bushings on the tuning capacitor so it doesn't bind, those two metal dials cord are a pain to replace.
Sam's doesn't support any sets before 1946 so for any service info your going to be look at service info from the manufacturer or Rider's. Fortunitly Philco was very good about supplying tech support to their dealers. In some instances poor diagrams have been redrawn for better readability.
As for a few simple test. Unplug the large plug the goes to the speaker and measure the resistance of the 4 pins. All should show some resistance against each other below about 4000 ohms.
The other simple test is the remove the #80. With the chassis out of the cabinet remove the sheet metal bottom cover. Measure the AC at the 80 socket across the two smaller terminals Be careful there's about 700vac. Should see about 700vac there.
These tests will tell if the power transformer and speaker are ok. There are many other things to check but these are the two big things.
While you are in the gathering mode don't use electrolytic caps for the filter in the power supply. There are a couple of 2mf and 1.5mf (the ones in side the can and #43). These should be replaced with modern film capacitors @ 630v.
Before you go too far apply a little bit of oil the the bushings on the tuning capacitor so it doesn't bind, those two metal dials cord are a pain to replace.
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
