>If memory serves me, the ALPHA 91B uses a 50 ohm 90W bulk type resistor
>strapped directly from grid to ground
>(only a bias-blocking cap intervenes). We use a simple network ahead of
>the resistor to compensate tube
>input C on 10 & 12M.
tnx. I'll try to get a copy of the roadmap so I can see what this 'simple
network' is, Dick.
>Subject: Re: [AMPS] 4CX1000A advice??
>>On Fri, 13 Mar 98 08:40:20 -0800 Rich Measures <email@example.com> writes:
> One of the "no hassle" untuned input circuits floating
>about recommends putting an inductor in series with the grid termination
>R to improve the 12m and 10m input SWR. Doing so is an invitation to vhf
>oscillation. If, QRO, and Alpha do not use such a circuit, Good.
> . However, one does not know until one sees the circuit.
? . . To anyone on the [AMPS] group who has a circuit diagram for an Emtron,
Alpha, or QRO Class AB1 amplifier, and is willing to do some xeroxing, I need a
copies of only the portion of the circuitry that is associated with the tube
and .grid input. . I will reimburse the copying and mailing costs involved. .
Or, for those with a scanner, if the image is saved as a JPG file, it can
easily be e-mailed as as attachment, provided that additional compression is
not checked off. I plan to make JPG files from the xerox copies so that I can
post the diagrams on the Web so that interested members of the [AMPS]
mailing-list can discuss 'em. . thanks
R. L. Measures, 805-386-3734, AG6K
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