Plate voltage on a Philco 37-650 - Printable Version

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+--- Thread: Plate voltage on a Philco 37-650 (/showthread.php?tid=14118)

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Plate voltage on a Philco 37-650 - onlyrick - 02-24-2016

Good morning ,could anyone give me the plate voltage on the 6F6 tubes in a
model 37-650,I am getting 357 volts ,is this right ?,thanks for any help.
All the best Rick

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RE: Plate voltage on a Philco 37-650 - KCMike - 02-24-2016

 Hello Rick. Do you happen to have a schematic for the radio? There should be a tube voltage chart on it.

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RE: Plate voltage on a Philco 37-650 - KCMike - 02-24-2016

Just in case you don't:
http://www.nostalgiaair.org/Resources/219/M0013219.htm
Looks like 250 volts for the plate. The schematic is kind of blurry.

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RE: Plate voltage on a Philco 37-650 - onlyrick - 02-24-2016

Hello Mike
I have the same schematic but I don,t see the
plate voltage anywhere,thought one of the
members might know it ,thanks Rick

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RE: Plate voltage on a Philco 37-650 - KCMike - 02-24-2016

Should be in box below the power transformer data. Maybe you don't have that page.
Here is the schematic from another source. Hope it helps.
http://www.theoldradiofixerupperguy.com/pdf/Philco/37-650.pdf

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RE: Plate voltage on a Philco 37-650 - jerryhawthorne - 02-24-2016

Looks like 250 from plate to ground for each tube. If your running 357V those tubes are not conducting.
Jerry

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RE: Plate voltage on a Philco 37-650 - onlyrick - 02-24-2016

Hi Again
Thanks for the schematic,looks like I am 100 volts over on the 6F6 plates,the set will run
for an hour and a half fine then the speaker starts making a noise like it is torn or there
is something leaning against the speaker cone,I tried three other speakers same thing.
Do you think it is from the high voltage on the plates,is there a way I can bring it
down close to where it should be without burning out the transformer,I can run the
set now for four hours and the power transformer is not hot just a bit warm,I could
hold my hand on it as long as I want,runs rather cool for a power transformer.After
about and hour and a half I put the base on min. and turn down the volume,thankful
for any help,all the best Rick

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