[Amps] 813 efficiency

[peter chadwick]

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