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[AMPS] 4CX1000A advice??

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Subject: [AMPS] 4CX1000A advice??
From: (Rich Measures)
Date: Sun, 15 Mar 98 08:05:33 -0800
>Hi Rich...
Hello, Dick
>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 <> 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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