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4CX250B cathode driven input impedance

Jan 6th 2012, 15:30


Joined: Feb 6th 2011, 20:24
Total Topics: 0
Total Posts: 0
Dear forum,

I'd like to design the matching PI input network for my 2x 4CX250B homebrew cathode driven HF amplifier and furthermore get into a deeper understanding on the optimal energy transferring from the RTX to the amplifier. I couldn't find any helpful in databook or SPICE models of such tubes.
May I get use of the PC-EL software somehow?
What is the cathod impedance in a grid grounded configuration?
Someone said 120 Ohm per tube with 15 pF or so in-parallel capacitance, but I don't have any datasheet confirmation on that.

Thanks indeed

IW3GHD, Stefano

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