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
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