Hi Carl, Marv,
I was about to suggest to simply reverse the order of things, and do this:
1) add up the tube's capacitance, stray capacitance, and minimum
capacitance of the plate tuning cap;
2) Calculate the PI network for that input capacitance, which will
require a higher loaded Q than the one your original capacitance spec
was based on;
3) Put up with the more critical tuning and higher losses caused by this.
But after reading Carl's suggestion,
> Simply wind the 10M coil as per the software program using your favorite Q
> while ignoring any C. Then center tap that coil with the Tune C; it will be
> 4X ratio so now you need 4X the C to resonate.
>
> The effect carries thru the other bands and rapidly becoming unoticable.
I cannot do anything else than bow my head to long-standing experience,
and mention my own idea just for its anecdotical value! Do what Carl
says, Marv...
I will go back to my MOSFETs instead. My experiments are advancing. I'm
fighting device capacitances too, but in another way... I hope that in a
few months I will be testing a low cost mosfet legal limit amp on the air.
Manfred.
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