Quote:
Originally Posted by Sideband
According to Wikepedia:
'The longest recorded valve life was earned by a Mazda AC/P pentode valve (serial No. 4418) in operation at the BBC's main Northern Ireland transmitter at Lisnagarvey. The valve was in service from 1935 until 1961 and had a recorded life of 232,592 hours. The BBC maintained meticulous records of their valves' lives with periodic returns to their central valve stores.
Rich
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Hmm, I think I know where Wikipedia got ther info from; the Mazda Valve Data book 1968. And from my copy, a picture of the 'offending' device - and very fine it looks too. I'm thinking that at the time this record was achieved transistors hadn't been around long enough to equal this record. In fact if my maths is vaguely close the
very first transistors would have had to survive until 1974 to equal it.