As a matter of interest, what was the 572B originally designed for, and when
did it come out? I'd guess it was originally a class B zero bias modulator
tube for producing about 500 watts of audio, but I don't recollect ever
seeing a modulator design with them published. They seemed to appear as SSB
GG amps around 1960 or so, but I wouldn't have thought that a tube designed
then for SSB GG service would have been designed with such a structure -
long thin grid lead etc. Tube technology then could have put that sort of
tube on a pressed base, with much shorter leads.
73
Peter G3RZP
--
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
|