4CX250B cathode driven input impedance
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| Jan 6th 2012, 15:30 | |
IW3GHDTotal 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 73 IW3GHD, Stefano Italy |
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