How fast vacuum tube logic can be?

A project log for Hot logic

Ridicule doesn't kill but HV does. I hope to avoid both while using some 1Ж29Б-В and 6Н21Б

Artem KashkanovArtem Kashkanov 05/25/2020 at 07:450 Comments

I started experiments with logic element circuits to understand the performance of one logic element - a vacuum tube.

I found, that triode in a simple circuit from IBM 604 can handle up to 1 MHz square signal with appropriate front. But 6N23P was used - it's a high frequency triode. This is very slow for my purposes - If i wan reach 1MHz clock - Out edges must fit into 50ns.

Orange signal - control grid, 30ns edges, Blue signal - anode. Rising edge 200ns.

First schema to test. Anode resistor can vary in 5-33k, but doesn't influence the fronts.