Re: Valve Questions
It's worth pointing out also that the much earlier Philips ECH21 matched the ECH81 both in terms of conversion conductance and pin-out versatility, allowing independent use of the heptode and the triode. This was of course well exploited by Philips in their 3 + R superhets.
The B8G base was a historical loser, but it sported some excellent devices in its short term of popularity. The ring seal construction would have given good VHF performance also.
Leon.
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