[Amps] 813's

[Vic K2VCO]

k7fm wrote:
> The RCA Transmitting Tubes Technical Manual TT-5 states the following:
> 
> OPERATING CONSIDERATIONS
> 
> "The 813 ... may be operated in vertical position with base up or down, or 
> in horizontal position with pins 2 and 6 in vertical plane."
> 
> Be sure to reduce ratings to 50% if you are operating it at 120 MHz.

There was an article in ARRL handbooks of the late '50s or early '60s 
describing a series of single-band amplifiers each using a pair of 
813's.  Construction was simple, with a pair of chassis behind a short 
rack panel and the 813's mounted horizontally.  The author left the 
plate voltage connected and just lit the filaments (and I presume 
switched drive and antenna) of the one he wanted to use.  I built a 
similar amplifier, although mine was for 80-40-20 meters.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco