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Old 28th Nov 2017, 6:16 am   #3
Synchrodyne
Nonode
 
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
Posts: 2,943
Default Re: Mazda 30F27 RF tetrode for TV tuners.

Curiosity got the better of me, and I did a quick search to obtain some idea of the extent to which the 6CY5 tetrode was used in American VHF TV practice. I found a couple of examples.

It was used in the Sarkes Tarzian Hot Rod VHF turret tuner of the late 1950s. That the latter had a tetrode RF amplifier is confirmed by Tarzian advertising, and that the tetrode was the 6CY5 was confirmed by a mention in respect of its use in a Hoffman TV receiver:

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Name:	Electronics 1959 p.149 Tarzian Hot Rod Tuner with Tetrode RF.jpg
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ID:	152983Click image for larger version

Name:	PF Reporter 195909 p.02 Hoffman TV Rx with Hor Rod Tuner with 6CY5.jpg
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ID:	152984

The 6CY5 was also used by RCA in its KRK71D/E VHF tuner:

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Name:	R&TVN 195904 p.79 RCA KRK71D-E with 6CY5 Tetrode.jpg
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ID:	152985


Cheers,
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