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Restored Philco 46-420 code 121 has slight low pitch hum.
#4

>The 2 existing 20 mfd electrolytics are currently connected to pins 4 and 8 (+ end) and the - end to B+.
Both - ends of C15 should be connected to B-. If not you get a bunch of hum and the b+ volt will be low. Remove the cap w/the b+ connected to the - and chuck it replace w/new.

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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RE: Restored Philco 46-420 code 121 has slight low pitch hum. - by Radioroslyn - 03-17-2019, 07:39 PM



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