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

[Alan Gray]

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


----- Original Message -----
From: "James C. Garland" <4cx250b@muohio.edu>
To: <eto_alpha@mailman.qth.net>
Sent: Wednesday, November 20, 2002 6:02 AM
Subject: [ETO_Alpha] Re:Question about alpha 77dx/sx amps


> Positions A and B on the 77Dx/Sx amps are prewired for 1.8-2.0 MHz.  The B
> position has extra loading capacitance.
>
> The other bands are: 3-5 MHz
> 5-8 MHz
> 8-12 MHz
> 12-18 MHz
> 24-30 MHz  (this band not available on the 77SX, because the output cap
> of the two tubes is too high)
>
> 73,
> Jim W8ZR
>
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