Any benefit to DC heater on parallel supply rectifier (GZ34)?

leadbelly · 13th February 2006, 05:44 AM

I know that there is no consensus on preference of AC or DC for tube heaters. However, for those that do use DC for their heaters, would the same hum elimination benefits apply to using DC for a parallel heater connected rectifier tube such as a GZ34? Or, if I am right in understanding the issue, would any induced ripple from the AC heater be common mode with the transformer secondary ripple and thus get taken care of with whatever filtering is already being performed in the power supply?

EC8010 · 13th February 2006, 09:44 AM

No benefit at all.

martinab2 · 13th February 2006, 11:00 AM

Heater supply will cross zero volts at the same time as the rectifier is switching. If anything, that should make an ac heater supply less noisy than dc. Cant see either option making the slightest bit of difference though.

13th February 2006, 05:44 AM	#1
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Any benefit to DC heater on parallel supply rectifier (GZ34)? I know that there is no consensus on preference of AC or DC for tube heaters. However, for those that do use DC for their heaters, would the same hum elimination benefits apply to using DC for a parallel heater connected rectifier tube such as a GZ34? Or, if I am right in understanding the issue, would any induced ripple from the AC heater be common mode with the transformer secondary ripple and thus get taken care of with whatever filtering is already being performed in the power supply? __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

13th February 2006, 09:44 AM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	No benefit at all. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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13th February 2006, 11:00 AM	#3
martinab2 diyAudio Member Join Date: Mar 2004 Location: aberdeen, uk	Heater supply will cross zero volts at the same time as the rectifier is switching. If anything, that should make an ac heater supply less noisy than dc. Cant see either option making the slightest bit of difference though.

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