I always thought that the 3CX3000A7 had a directly heated cathode (a thoriated
tungsten filament), but the schematic for the Henry 8K Ultra clearly shows a
cathode distinct from the filament. The filament transformer's secondary
winding center-tap is grounded, and the cathode is biased.
What's the story? BTW, I couldn't find the answer at Eimac's website.
-Chuck W1HIS
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