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Re: [Amps] Amp ideas needed

To: Bill Turner <dezrat1242@yahoo.com>, amps@contesting.com
Subject: Re: [Amps] Amp ideas needed
From: Radio WC6W <wc6w_amps@yahoo.com>
Date: Thu, 2 Jul 2009 09:22:17 -0700 (PDT)
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Hi Bill,
  25 dB is a lot to expect from a single stage but...

  Perhaps, you should consider the 4CX350FJ.  It only takes 20V peak RF drive.  
A swamped grid input, with a suitable parallel L to cancel the input C on the 
higher bands, would work fine with 5 watts drive.  No neutralization required.

  Four paralleled could be pushed to the legal limit; amateur style.  5 or 6 
would be a more reasonable approach.

  Or perhaps a two stage amp with a '350 input driving any suitable tube.  
Enough extra gain would be available to incorporate serious RF feedback for 
superb linearity.

73 & Good morning,
  Marv WC6W

http://wc6w.50webs.com/

--- On Wed, 6/24/09, Bill Turner <dezrat1242@yahoo.com> wrote:

> From: Bill Turner <dezrat1242@yahoo.com>
> Subject: [Amps] Amp ideas needed
> To: "Me" <dezrat1242@yahoo.com>
> Date: Wednesday, June 24, 2009, 11:23 AM
> Looking for some ideas on how to best
> design an amp.
> 
> In September, Flex Radio is going to offer a Software
> Defined Radio,
> model Flex-1500, for just under $600. It will be a QRP
> version with
> only five watts output.
> 
> How would you design an amp for 1500 watt output on 160-10
> meters with
> only five watts drive? Some possibilities:
> 
> 1. A grounded-cathode 4CX1000A (or similar) with high
> impedance input
> and Bruene neutralization.
> 
> 2  A grounded-grid 8877 (or similar) with a modular
> solid state driver
> such as one from Communication Concepts or similar.
> 
> Other suggestions? 
> 
> 73, Bill W6WRT
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> 


      
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