km1h @ juno.com wrote:
>
>
> >
> > A 200 with good tubes and a stiff 240V line will output 700-800W with 100W
> > of drive. For intermittent operation this will not overheat the
> xfmr. For contesting, etc, it is best to run about 600W.
> With a new pair of Chinese tubes and 120W of drive I obtained 900W from a 6M
> conversion but that is really pushing the PS.
>
> What mods are recommended for the SB200 to improve efficiency other
than replacing the electrolytics and putting in a good set
of tubes?
Can anyone recommend a good source for 572Bs?
Tnx and 73
KN4AB George
ex WB2BEV
>
>
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