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In Reply to: RE: Why? posted by Mechans on April 08, 2017 at 11:04:30
"Why aren't all tubes made like this?"
Bendix went from zero to hero in a very short amount of time. The "Red Bank" types were intended for the severest kind of military service. Only the "blank check" on the U.S. Treasury made available to the Military by Congress could fund that sort of product.
I guaranty you "ordinary" folks back in the 1950s were not about to pay $10, let alone more, for the 5Y3 "equivalent" 6106. For the time frame, serious money.
Military tubes had to be extra tough. We used tube-powered radar in our combat aircraft in the 1950's and 1960's until the aircraft industry went solid state. SS equipment was much lighter in weight, which on aircraft was extremely important. Don't know if the SS equipment was any more reliable than the tubed equipment, but the Soviets (think MiG's) relied on tubed aircraft radar at least through the end of the 1970's. They claimed that tubes were more reliable than transistors for their purposes.
Probably a good reason for the continued popularity of mil-spec tubes among certain audiophiles.
The inner structure makes a TS 6550 look under-engineered. IIRC, very heavy tubes.
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