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Re: [Amps] Small Amplifier

To: "Amps@contesting.com" <Amps@contesting.com>
Subject: Re: [Amps] Small Amplifier
From: "Will Matney" <craxd1@ezwv.com>
Date: Tue, 18 Jan 2005 10:33:30 -0500
List-post: <mailto:amps@contesting.com>
I have seen where some tried running the cathode driven. However they weren't straight G-G as they used some screen voltage and a bias. They don't run too hot this way in my opinion. But, they carry a lot of whollop when running four as grid driven with very little drive. Most amateur amps using this setup had an attenuator in the grid circuit to allow a transceiver with standard output to drive them. The first one of these I'd built, I can remember remarking, "Now that will walk the dogs and lead the pups" :) If I were to build again, I would have to use a couple of 4CX800's though. Way less expensive and easier to fabricate.

Will



On Tue, 18 Jan 2005 01:05:52 -0800, R. Measures <r@somis.org> wrote:

Since c. 75% of the total grid-I flows in the (2w) control-grid and c. 25% of the total grid-I flows in the (12w) screen grid, the 4cx250B hardly seems to be suited for g-g operation. However, a friend tells me that it has been done on SSB.

On Jan 17, 2005, at 4:32 PM, carl seyersdahl wrote:

Is the 4cx250b useable in G-G?? (safely)
   carl / kz5ca
----- Original Message -----
From: "Will Matney" <craxd1@ezwv.com>
To: <Amps@contesting.com>
Sent: Friday, January 14, 2005 12:15 PM
Subject: Re: [Amps] Small Amplifier


David,

I think if I wanted the ability of full legal limit power, I'd run (4)
4CX250B's in parallel. I've built a few of those and they do have the
muscle.

Will



On Fri, 14 Jan 2005 11:26:18 -0500, David C. Hallam <dhallam@rapidsys.com>
wrote:


I want to build a new small amplifier for those times when I really
don't
want to heat up the shack with the 5CX1500A. I have a supply of
4CX300's
and sockets as well as 4CX250's and sockets.  I plan to use two in
parallel.
Is there anything to recommend one over the other?

David C. Hallam
KC2JD


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Richard L. Measures, AG6K, 805.386.3734. www.somis.org



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