[Amps] Amp ideas needed

[Carl]

The Russian 4CX400A uses the same 4CX250 style socket and will easily and 
reliably do 600W out each with 2500V. They make for a fairly simple 
conversion to the overpriced 8122's in a NCL-2000.

In an AM-6155 conversion they do 400W + on 432 with 2W drive and 
considerably lower B+.

Carl
KM1H


----- Original Message ----- 
From: "Radio WC6W" <wc6w_amps at yahoo.com>
To: "Bill Turner" <dezrat1242 at yahoo.com>; <amps at contesting.com>
Sent: Thursday, July 02, 2009 12:22 PM
Subject: Re: [Amps] Amp ideas needed



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 at yahoo.com> wrote:

> From: Bill Turner <dezrat1242 at yahoo.com>
> Subject: [Amps] Amp ideas needed
> To: "Me" <dezrat1242 at 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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> Amps at contesting.com
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>



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