Heater reference

Nixie · 2nd July 2006, 03:31 AM

I want to use regulated DC heaters instead in this hybrid:
http://www.headwize.com/projects/sho...lmore4_prj.htm
My question is, what voltage do I reference the heaters to? The datasheet for the tubes specifies 100 V maximum cathode to heater potential.

poobah · 2nd July 2006, 03:43 AM

Reference your heaters to the -400 Volt rail.

Nixie · 2nd July 2006, 03:49 AM

Since the tubes are cathode driven, wouldn't the cathode voltage swing quite far from the bottom rail? I thought the -350 shown on the schematic is probably the no-signal idle voltage.

poobah · 2nd July 2006, 03:58 AM

If one cathode is pulled all the way down to -400 Volts, it is a reasonable assumption the other cathode does not rise above -300 volts. With the heaters biased reference at the -400 Volt rail. the voltage from cathode to heater should always fall between 0 to 100 volts.

2nd July 2006, 03:31 AM	#1
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Heater reference I want to use regulated DC heaters instead in this hybrid: http://www.headwize.com/projects/sho...lmore4_prj.htm My question is, what voltage do I reference the heaters to? The datasheet for the tubes specifies 100 V maximum cathode to heater potential.

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2nd July 2006, 03:43 AM	#2
poobah diyAudio Member Join Date: Nov 2005	Reference your heaters to the -400 Volt rail.

2nd July 2006, 03:49 AM	#3
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Since the tubes are cathode driven, wouldn't the cathode voltage swing quite far from the bottom rail? I thought the -350 shown on the schematic is probably the no-signal idle voltage.

2nd July 2006, 03:58 AM	#4
poobah diyAudio Member Join Date: Nov 2005	If one cathode is pulled all the way down to -400 Volts, it is a reasonable assumption the other cathode does not rise above -300 volts. With the heaters biased reference at the -400 Volt rail. the voltage from cathode to heater should always fall between 0 to 100 volts.