On 04/26/2016 10:49 AM, Paul Koning wrote: > That tube is interesting: it's the world's first integrated circuit. > Yes, a hollow state integrated circuit. I describe it that way > because it is a complete subsystem (in this case, a complete 3 stage > audio amplifier) rather than just something like a dual-triode tube > where the connecting components are still external.
Reminds me of the time I got my hands on a 1940s 3A8GT - battery pentode, triode, double diode in one envelope. Not nearly as interesting as the one in in the Dutch model, though. What was the highest level of integration in a single envelope? I seem to recall that some of the European taxes were based on the number of tubes in a radio, so there was a strong impetus to integrate. --Chuck