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Presumably you meant to say 7uS? 7ns would require over 400mA into 10pF. That seems pretty high for a vacuum tube, especially considering the Miller effect you mentioned.Papabravo said:Close behind is vacuum tube bi-stable multivibrator (aka Flip-Flop). Logic High was 300 VDC and logic low was GND. Rise and fall times were a zippy(for 1967) 7 ns.