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Yes, the 7F8 was purposely built like that, with mixer and oscillator service in mind. Somewhere I have a paper describing the development of the tube and motivation behind it. GE used it in the 801, 802, 901, and probably the 803 as well. Philco used it in the 1948 model sets. There were a few others as well. It was a good idea, but I've had to buy a bunch of them and hand pick them for least drift.
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