12-30-2018, 06:34 PM
Check the resistance of the primary of the ant coil. This can easily be accomplished by measuring from the ant and gnd post on the chassis w/the volume control turned up.
Next check the resistance of the feedback winding on the osc coil, one end is grounded and the other connects to a 6K resistor.
Both of these winding should show a low resistance like <20 ohms. If higher you'll need to rewind them, not difficult abt 20-25 turns.
OBTW there's two different versions of the 37-84 a code 121 (older using standard base tubes) and a code 122 using octals.
Original service info is here: http://www.audiophool.com/Philco.html Look up 1934 and click on 84.
Terry
Next check the resistance of the feedback winding on the osc coil, one end is grounded and the other connects to a 6K resistor.
Both of these winding should show a low resistance like <20 ohms. If higher you'll need to rewind them, not difficult abt 20-25 turns.
OBTW there's two different versions of the 37-84 a code 121 (older using standard base tubes) and a code 122 using octals.
Original service info is here: http://www.audiophool.com/Philco.html Look up 1934 and click on 84.
Terry
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
