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ampage archive

Vintage threads from the first ten years

Dc Heater/Filament supply

1/22/2006 9:33 AM
Joe	Dc Heater/Filament supply Does anyone have an effective method for converting the ac heater supply in a 5E3 circuit to DC?

1/22/2006 10:00 AM
Mark Lavelle	I think I can speak for a lot of people in saying that there is no point in converting the heater circuit in a 5E3 to DC. You will actually be risking adding noise. If you need to reduce hum, look at changing your layout.

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1/22/2006 10:06 AM
Joe	Thanks

1/22/2006 10:28 AM
ukiahb	agree that an amp can be built with AC heaters with very low hum and that DC heaters are generally not worth the trouble for guitar amps....however, if you must do it, only supply the first two tubes with DC (12AY7 and 12AX7) and wire the filaments for 12v operation and in series, they will only pull 150mA this way so filtering and regulation is much easier, this is how it was done on some old tube hifi amps...RS has a 25v xfmr that would work...I have a partial schematic showing this at http://home.pacbell.net/billc99/photos/s1000ps.JPG

1/22/2006 10:28 AM

ukiahb

agree that an amp can be built with AC heaters with very low hum and that DC heaters are generally not worth the trouble for guitar amps....however, if you must do it, only supply the first two tubes with DC (12AY7 and 12AX7) and wire the filaments for 12v operation and in series, they will only pull 150mA this way so filtering and regulation is much easier, this is how it was done on some old tube hifi amps...RS has a 25v xfmr that would work...I have a partial schematic showing this at http://home.pacbell.net/billc99/photos/s1000ps.JPG

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