[Amps] Grounded Screen 4CX1500B

[R.Measures]

On Nov 6, 2005, at 8:12 PM, Shawn Tayler wrote:

> Hi Guys,
>
> Playing with my 30S-1 has gotten me thinking about a project.  I've 
> been
> wanting an amp for 50Mhz for a while and I have 2 4CX1500B's lating 
> around
> as spares.  One would make a nice amp on 6M and I think I'd like to do 
> the
> grounded screen arrangement like the 30S-1.
>
> Could any of you comment on the pros and cons?

Less power gain in cathode driven config.

> The PS arrangement seems
> unusual to me with the plate supply return on the groud ie. screen and 
> the
> cathode return appearing to go through the bias and screen supplies.  
> I'm
> sure I'm mis reading it.  IIRC the Continental 816 I maintained so 
> years
> back was of a similar arrangement, 4CX15000A.

Wasn't it grounded-screen, grid-driven, not grounded-screen 
cathode-driven?

> But the plate screen and
> grid supplies returned directly through the cathode with all kinds of
> bypassing.

A seriously bypassed cathode means that it's grid driven.
>
> Comments?
>
> Shawn
> N7LQ
>
> -- 
> Mitchell's Law of Committees:
> 	Any simple problem can be made insoluble if enough meetings are
> held to discuss it.
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org