Philco 51-931 tubes - Printable Version

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+--- Thread: Philco 51-931 tubes (/showthread.php?tid=16226)

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Philco 51-931 tubes - Jimradio - 02-11-2017

Hi guy's, Restoring a Philco 51-931 code 122, the Rider schematic shows a 35Z5GT as the rectifier but this radio has a 35Y4 loctal tube. It should not be an issue for restoration, just thought it was a little odd.

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RE: Philco 51-931 tubes - Jim Koehler - 02-11-2017

It won't be......just watch the pin out configuration. 
Good luck with a nice radio.....
...Jim

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RE: Philco 51-931 tubes - morzh - 02-11-2017

The 35Z5 is a predecessor and an electrical equivalent of the 35y4.

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RE: Philco 51-931 tubes - Jimradio - 02-11-2017

Thanks for the reply guy's.

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RE: Philco 51-931 tubes - Jimradio - 02-12-2017

Guy's, after posting this thread I noticed that this radio also has a 50L6 instead of the 35L6 which the schematic shows. It looks as thought this is an original tube.

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RE: Philco 51-931 tubes - Jimradio - 02-14-2017

Got this radio up and working, put the 35L6 in the radio instead of the 50L6, someone must have replaced this tube. The radio has very good reception.........

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RE: Philco 51-931 tubes - Mondial - 02-14-2017

Does your radio have a 100 ohm resistor (R5) in series with the tube filaments? It looks like it connects between the filament pins of the two 7B7 tubes.

This resistor drops the filament voltage by 15 volts, which is the same amount that would be needed for a 50L6 compared to a 35L6. If there is no R5 series resistor, the circuit requires a 50L6.

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RE: Philco 51-931 tubes - Jimradio - 02-15-2017

(02-14-2017, 10:38 AM)Mondial Wrote:  Does your radio have a 100 ohm resistor (R5) in series with the tube filaments? It looks like it connects between the filament pins of the two 7B7 tubes.

This resistor drops the filament voltage by 15 volts, which is the same amount that would be needed for a 50L6 compared to a 35L6. If there is no R5 series resistor, the circuit requires a 50L6.

Thanks for your reply, yes is does have a 100 ohm resistor there in fact it was a dog bone type which I replaced..................
Thanks again.

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RE: Philco 51-931 tubes - Jimradio - 02-15-2017

Just thought I would show the radio in question, it is completed.        

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