[AMPS] Eimac 3CX3000A7 cathode

[Chuck Counselman]

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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