>
>Amp aficionados, et al;
>
>I have a 6 M SB-220 conversion that works quite well with
>one tube. Input SWR is 1.1:1 and output plate tune is at
>about 1/3 mesh. Efficiency is as expected. However, when I
>put two tubes in the beast I have to go to min plate C for
>max output.
Two tubes requires that L be cut in half and C-tune be doubled to
maintain the same Q. Guessing at tank values is not good engineering
practice. And remember, Pi-networks are not quite resonant on their
operating frequency.
cheers, Art.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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