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RE: Latest Schematic

not that it matters that much in this situation due ot the CCS and the large inductance of your grid choke but...

The curves for the 7788 you have posted assume a bypassed cathode. Leaving the cathode resistor unbypassed will give you a drastically different set of curves.

I don't have a model for the 7788 but running the curves for a 437A with and without a 91 ohm cathode resistor gave me this. The math says the Rp of the unbypassed situation should be around 6K and the curves match that.




dave


Edits: 09/16/09
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