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kdhorst
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Posts: 1
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Joined: Feb 2020
City: pinckney State, Province, Country: mi
#1

11-05-2023, 11:06 AM
works fine on isolation transformer. on ac line smokes vol control and 325 w/w resister smokes. suspect pwr xfmr
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Radioroslyn
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Posts: 7,248
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Joined: Dec 2009
City: Roslyn Pa
#2

11-05-2023, 12:09 PM
Hmmm rather odd. The volume control doesn't really have much to do with any thing in the p/s. The sw does though. What happens if you run it w/the 5Y4 unplugged? Are the plate voltages even between the ct and the plates at the 5Y4 socket? Do you have the chassis connected to an earth ground? Have you done any service work to the chassis? What does #30 measure in ohms?

https://philcoradio.com/library/download...%20244.pdf
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
(This post was last modified: 11-05-2023, 12:11 PM by Radioroslyn.)
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morzh
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Posts: 15,444
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Joined: Oct 2011
City: Jackson, NJ
#3

11-05-2023, 03:10 PM
How about that 0.005uF cap from line to chassis? Does it smoke if you rotate the power plug while operating without the IT?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
(This post was last modified: 11-05-2023, 03:11 PM by morzh.)
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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration