16-07-2022, 08:36 AM
Yes, the Rod types are Russian Military only. The idea was mooted generally in the 1930s and as I wrote some octode/heptodes and all Pentode characteristic Beam Tetrodes (or Kinkless Tetrodes, hence KT66 etc) use electrostatic lens principles. Development & production was from early 1950s to the early 1980s. Production only ended with the collapse of the USSR. Soviet factories, especially for military production, had almost automatic production quotas. So in 1991 there was excess stock of millions, hence various sellers in Ukraine, Bulgaria, Russia and some other ex-Soviet influence countries.
I have quite a few NOS and ex-equipment Western sub-miniature types. Also developed for proximity fuzes, but earlier. There is even a pentode-triode for mixer-oscillator. Quickly used in handheld two way radios, some larger PRC series US military, hearing aids (some with 0.7V filament for a two valve amp, 1.4V LT and 22.5V HT) also some US and quite a few Japan pocket radios that usually had a regular B7G battery valve for speaker unless a earphone only model. Using 45V or 67V layer pack like an elongated 6F23/PP3/9V pack.
The last Western miniaturisation was the nuvister, used in some USA mains FM radios. Really only Europe did domestic portable FM battery valve sets. None at all in USA except one novelty set and the only USSR battery valve VHF portable were for military or space use. The one Forestry model is maybe just HF, not sure. Could be band 1.
I have quite a few NOS and ex-equipment Western sub-miniature types. Also developed for proximity fuzes, but earlier. There is even a pentode-triode for mixer-oscillator. Quickly used in handheld two way radios, some larger PRC series US military, hearing aids (some with 0.7V filament for a two valve amp, 1.4V LT and 22.5V HT) also some US and quite a few Japan pocket radios that usually had a regular B7G battery valve for speaker unless a earphone only model. Using 45V or 67V layer pack like an elongated 6F23/PP3/9V pack.
The last Western miniaturisation was the nuvister, used in some USA mains FM radios. Really only Europe did domestic portable FM battery valve sets. None at all in USA except one novelty set and the only USSR battery valve VHF portable were for military or space use. The one Forestry model is maybe just HF, not sure. Could be band 1.
