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In Reply to: RE: IIRC posted by DAK on June 13, 2015 at 19:29:49
Land based Radar sites and radio sites I can see the need for 10,000 hour tubes: but for a missile? Even for aircraft, 10,000 hours probably passes the mark for servicing.PS: At our local FAA radio repeater transmitter sites, the amps, which used KT-88's, were changed on a monthly basis, because it was cheaper than the manpower required to check out the tubes. 10,000 hours translates to 250 weeks. That's a long time for a missile or rocket to stay in flight, as well as aircraft.
Edits: 06/14/15Follow Ups:
It would be great if anyone in the USAAF or SAC who worked with communications and/or missle or airplane avionics would let us know exactly what equipment the red base tubes were used in. But, still speculating, I would believe that the electronics for the missles in land based sites were always on as during that time the there were bombers circling the arctic circle carrying nuclear bombs 24/7. Crazy times! dak
I know they were used in Lockheed P2V Neptune autopilot servo motors. I've removed my share doing upgrades and conversions to firebombers. I kept what I needed and tossed the rest. This was about 1979-80. They also had 5881 and 5R4 as I remember.
In this case the 5692 was used in avionics where reliability and the ability to withstand severe vibration was a key requirement. While no one disputes that this tube was not designed for audio use, no one will hesitate to use it as an audio tube. I think the same can be said for the 6sn7wgt or 6sn7w which were also "industrial" versions of the 6sn7 family that are excellent for audio. cheers, Dak
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