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Old 2nd July 2006, 03:31 AM   #1
Nixie is offline Nixie  Canada
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Default 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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Old 2nd July 2006, 03:43 AM   #2
poobah is offline poobah  United States
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Reference your heaters to the -400 Volt rail.

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Old 2nd July 2006, 03:49 AM   #3
Nixie is offline Nixie  Canada
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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.
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Old 2nd July 2006, 03:58 AM   #4
poobah is offline poobah  United States
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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.
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