[Amps] 813 efficiency

[Carl]

Sorry I forgot to mention them as I do not allow any in the house (-;
The sheet metal anodes are like 811's, easy to blow a hole in them.

Carl
KM1H


----- Original Message ----- 
From: "peter chadwick" <g8on at fsmail.net>
To: <amps at contesting.com>
Sent: Tuesday, February 26, 2013 2:55 PM
Subject: Re: [Amps] 813 efficiency


> Carl,
>>The 813 was way underated as are many other tubes of that era, my own use 
>>of
> them over decades indicates an ICAS Pd of 200-250W is more realistic and 
> use
> a little air on the glass. I show just a little color on SSB voice peaks 
> at
> 1200W for 4 tubes. On CW in a contest enviroment there is a fairly steady
> dark red<
> I'd agree about the carbon anode ones, but does that really apply to the 
> metal anode ones?
> 73
> Peter G3RZP
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