Thanks,
Johnny
Their screens tap into that supply and your CORRECTLY polarized capacitor is providing decoupling and filtering for them. 73's de Edd
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:I've marked up this Philco 90 schematic and have placed the + and - symbols in red at the cap in question. I believe I'm correct but would like some confirmation on that belief. And will a 50 volt cap be sufficient? Also I need to try to put a picture of the schematic here and I need to see if I remember the correct way to do it.
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:Thanks,
:Johnny
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:Sir Johnny. . . . .
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:Thats zackly right !
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:There is a main B+ feeder line coming in from the right and then feeding into a 10K / 25K voltage divider for creating a sub B+ for the frontal RF circuitry tubes.
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:Their screens tap into that supply and your CORRECTLY polarized capacitor is providing decoupling and filtering for them.
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:Thasssittt . . . .
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:73's de Edd
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:When a clock is hungry . . . it just goes back " four" seconds
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::I've marked up this Philco 90 schematic and have placed the + and - symbols in red at the cap in question. I believe I'm correct but would like some confirmation on that belief. And will a 50 volt cap be sufficient? Also I need to try to put a picture of the schematic here and I need to see if I remember the correct way to do it.
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::Thanks,
::Johnny
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: : : : : : : : : : : :Sir Johnny. . . . . : : :Thats zackly right ! : : :There is a main B+ feeder line coming in from the right and then feeding into a 10K / 25K voltage divider for creating a sub B+ for the frontal RF circuitry tubes. : :Their screens tap into that supply and your CORRECTLY polarized capacitor is providing decoupling and filtering for them. : : :Thasssittt . . . . : :Added about the screens voltages:
: : : : : :When a clock is hungry . . . it just goes back " four" seconds : : : : : : : |
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::I've marked up this Philco 90 schematic and have placed the + and - symbols in red at the cap in question. I believe I'm correct but would like some confirmation on that belief. And will a 50 volt cap be sufficient? Also I need to try to put a picture of the schematic here and I need to see if I remember the correct way to do it.
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::Thanks,
::Johnny
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:: :: :: :: :: :: :: :: :: :: :: ::Sir Johnny. . . . . :: :: ::Thats zackly right ! :: :: ::There is a main B+ feeder line coming in from the right and then feeding into a 10K / 25K voltage divider for creating a sub B+ for the frontal RF circuitry tubes. :: ::Their screens tap into that supply and your CORRECTLY polarized capacitor is providing decoupling and filtering for them. :: :: ::Thasssittt . . . . :: ::Added about the screens voltages: : : :The screens spec at up to 90 VDC on the tube manual, so why not use a 150 VDC rating on the cap. : : :And do a final spot voltage check after operational, just to be sure. : : :Also the 70K value of the divider resistor "typoed" out as being 10K. :: :Edd: ::73's de Edd :: :: :: :: :: ::When a clock is hungry . . . it just goes back " four" seconds :: :: :: :: :: :: :: |
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:::I've marked up this Philco 90 schematic and have placed the + and - symbols in red at the cap in question. I believe I'm correct but would like some confirmation on that belief. And will a 50 volt cap be sufficient? Also I need to try to put a picture of the schematic here and I need to see if I remember the correct way to do it.
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:::Thanks,
:::Johnny
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Thanks Edd!
Johnny