>
>
>-------Original Message-------
>
>From: measures
To: <amps@contesting.com>
>Date: Friday, April 27, 2001 08:32:48 AM
>To: ToddRoberts2001@aol.com; AMPS
>Subject: Re: [AMPS] Buffer/Driver Stage for 4-1000 Amp
>
>>
>>I am planning to use one of those 90-100 watt solid-state rigs to drive a
>>4-1000 amp project. From what I can gather it appears that to be able to
>>take
>>full advantage of an all grounded-grid/ cathode driven 4-1000 tube ,the
>>driver should be able to supply about 150-200 watts of drive. It would seem
>>the best answer would be to build a buffer/driver stage using perhaps a
>>single or dual 811A tubes that could be driven with maybe 25-50 watts and
>>deliver 100-200 watts of drive to the 4-1000. I was wondering if anyone has
>>ever tried this or any suggestions? How about a pair of 811A's running
>>class
>>A driving the 4-1000 cathode? Thanks for any ideas. 73 Todd Roberts WD4NGG .
>>
>? A 100w transceiver will drive a grid-driven 4-1000A/8166 operating in
>Class AB1.
>
>cheers
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>end
>
>I personally think grid drive is much better, especially with the better
>screen regulation availiable.
>As an added plus, the input circuit is real easy to make, and is
>broadbanded----meaning a simple bandswitch.
>73 STEVEN GRANT W4IIV
>
An AB1 grid terminating resistor is basically a broadband element.
However, at higher frequencies, a better input match is afforded by
tuning out grid reactance with a variable L. This facilitates Bruene
neutralization. If a variable L is also used in the tank, the amplifier
is general coverage.
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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