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@fsmail.net>
To: <amps@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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