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H-691 Do I need batteries
Radioroslyn
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#2

04-05-2022, 07:55 PM
You should good to go. No batteries needed in the circuit when operating on ac. The 7.5vdc coming off of R-9 is critical. If too high it can shorten the life of the tubes filaments. Too low there won't be enough emission from the filament for the tube to operate at it's full potential. You would want to be somewhere between 7.0-7.8vdc.

GL
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: 04-05-2022, 07:58 PM by Radioroslyn.)
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Messages In This Thread
H-691 Do I need batteries - by Ralph - 04-05-2022, 06:24 PM
RE: H-691 Do I need batteries - by Radioroslyn - 04-05-2022, 07:55 PM
RE: H-691 Do I need batteries - by Ralph - 04-06-2022, 07:09 AM



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  1. The PHILCO Phorum
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