[ETO_Alpha] Re:Question about alpha 77dx/sx amps

[James C. Garland]

At 11:15 AM 11/20/2002, you wrote:
>Jim,
>
>The 77SX is useable in part of the the 24-30 mhz range. Mine works fine on
>10M but isn't useable on 12M. This is not because of the output capacitance
>with the 2 tubes; rather, the self resonant frequency of the plate choke
>(approx 25 mhz)  prevents use on 12M.
>
>Alan, W3BV
>
>

I wasn't able to resonate my SX on 10 meters, though I didn't try at the 
low end of the band. It may be that the rf choke resonance also causes 
problems, but I don't think the tank circuit will permit full 10 meter 
operation with both tubes. One can't get a low enough capacitance from the 
tune capacitor, with both 8877s present.
Jim