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10th October 2006, 03:05 PM
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#1 |
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diyAudio Member
Join Date: Mar 2005
Location: Cubicle Sweet Cubicle, SW, MO, USA
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Heater to cathode voltage limits in cascodes???
I want to experiment with cascodes. I've got some military pulls 8532/6j4wa. If the two tubes in cascode are in different envelopes then doesn't that raise the heater to cathode voltage limit? I still should use two isolated filament windings? Thanks a whole heap! Ray
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10th October 2006, 03:48 PM
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#2 |
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diyAudio Moderator
Join Date: Jan 2003
Location: Near London. UK
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If your upper valve is in a different envelope it can have a separate heater supply. Instead of placing the strain of the elevated cathode voltage across the heater cathode insulation, you now strain the interwinding insulation of a mains transformer - which is far more capable of withstanding it.
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