12-22-2016, 04:02 PM
(12-22-2016, 03:36 PM)morzh Wrote: In many Philcos the Shadowmeter is bypassed with 2-3K resistor, so when the shadowmeter quits the radio still plays.
Hi Jon,
How tricks up in north Montco???
Took a quick look at the 37-630 schematic but I don't see a resistor across the shadow meter as Mike describes. My older 660 does have one. You could disconnect the sm and use a 1k or 1.5k 1/2w resistor in it's place. If that clears up the problem you'll need to rewind your sm coil. You could also monitor the hv at the bottom of the 1st IF transformer as the sm feeds it. If you see the voltage fluctuating a lot it's time to rewind. I suppose there could be an issue with the sm coil heating slightly from it's normal operation. THis might cause a sm break in the coil where it's warm.
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
