Re: Mazda 30F27 RF tetrode for TV tuners.
I may have gone some way to answering my own question.
The formula for shot noise below from Reyner & Reyner, Radio Communication (1972) suggests that shot noise increases with bandwidth rather than absolute frequency.
This would, in part at least, explain why the PC86 and PC88 are noisier than triodes operating at VHF.
Last edited by ukcol; 30th Nov 2017 at 2:00 pm.
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