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box style shadow meter and magnetism woes
Radioroslyn
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Posts: 7,301
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City: Roslyn Pa
#7

04-27-2023, 10:06 AM
Ok Here's some things to check. Pin 3 of the 42 tube should have about +320vdc from chassis. If it's lower than +300vdc find out why. If your 6A7 or either of the 39/44's have low emission that could cause it. Weak 6A7's are common.  Check #'s 66,26,33,34,and 37 for proper resistance, they may have drifted.
Now I'm assuming that you have replaced all of the foil/paper caps that are inside the bakelite blocks. If you haven't it's a must!

https://philcoradio.com/library/download...%20195.pdf

Happy Troubleshooting!
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: 04-27-2023, 10:19 AM by Radioroslyn.)
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RE: box style shadow meter and magnetism woes - by Radioroslyn - 04-27-2023, 10:06 AM



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