Yes, my memory didn't serve me correctly. You have the right line up
here. The 812s were the RF amps and the 811s were the modulators.
Ken K4XL
Paul and Abbi Elliott wrote:
>
> In the late 1930's and the early 1940's a very common transmitter line-up
> was a pair of 812's modulated by a pair of 811's. If the amplifier and the
> modulator were powered by a power supply of 1250 volts or less, the 811's
> could be run with zero bias. Although both tubes were rated for both audio
> and RF service, the 812 was used essentially only in class C rf
> applications and the 811 was used only a a class B modulator (in amateur
> ranks).
--
Ken K4XL
grimm@lynchburg.net
BoatAnchor Manual Archive - ftp://bama.sbc.edu
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|