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Re: [Amps] Need for input tuning circuit

To: "Vic Rosenthal" <vic@rakefet.com>, <wlfuqu00@uky.edu>
Subject: Re: [Amps] Need for input tuning circuit
From: "DF3KV" <df3kv@aol.com>
Reply-to: DF3KV <df3kv@aol.com>
Date: Sat, 9 Oct 2004 22:37:45 +0200
List-post: <mailto:amps@contesting.com>
----- Original Message -----
From: "Vic Rosenthal" <vic@rakefet.com>
To: <wlfuqu00@uky.edu>
Cc: <amps@contesting.com>; <philk5pc@tyler.net>
Sent: Saturday, October 09, 2004 8:10 PM
Subject: Re: [Amps] Need for input tuning circuit

> Years ago I built some 813 amplifiers for CW work.  I used the
standard
> clamp-tube circuit in which class-C bias is generated by the grid
current flow
> through a resistor (i.e., the bias is in effect rectified driving
voltage) and
> the clamp tube protects the tube by removing screen voltage when the
key is up.
>   This had the advantage of preserving the keying waveshape while
running the
> tubes in full class-C for efficiency.


Hi Vic,

How was full class-C maintained on the opposite cycle, when  no grid
current flows?
For full class-C the 813 has to be biased with -155V at 2250V EHT

73
Peter

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