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#111
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just an anecdotal story
"Gary Heston" > wrote in message > I was told several years ago (ok, at least 20 years ago) that the original > electronics in the MIG-25 were vacuum-tube based for exactly that reason. > >> But in Russia or China, smaller military budgets and presence of vacuum >>tube manufacturing plants could make them prefer more-antique electronics >>as a way to reduce EMP vulnerability. > > Consider also the difference in manufacturing technology required for > producing vacuum tubes and semiconductors--the tubes are basically > complex light bulbs and don't require massive clean rooms, tons of toxic > chemicals and nanometer-precise optical equipment. Building tubes is > _easy_, building high-power semiconductors is very difficult and > expensive. > So what if they take a little more power? That's easier to make than a > semiconductor fabrication facility. > > > Gary I have heard the same thing, Gary. These were the miniature "peanut" tubes, IIRC, which we used for a while here in the USA for portable radios, etc. |
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#112
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just an anecdotal story
anumber1 > in
: > I have vacuum tube rectifiers (for the old 1950s electronics that I > restore for fun) that are made in China. They are marked "Made in Chian looks like a minor misspelling of "Made in Chains" |
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