Joe Isabella wrote:
Seems reasonable to have some kind of interlock for this -- a couple
dollars worth of parts could easily save several hundred in new tubes.
A friend of mine switched to a pair of 3CPX800s because the squirrel
cage fan came loose from the motor shaft in his Alpha. Tubes pretty
much melted.
Another experience, for what it's worth...
I once wired the blower capacitor on the 2x4CX400A 2m amp so that the
motor ran at about half speed, and backwards. (The motor was going
round, lots of rushing-air noises, right?)
By the time I eventually noticed there was practically no air coming out
the exhaust, and maybe the tuning was drifting just a little at the 1kW
output level, the poor 4CX400As were practically black from overheating.
But when the motor was wired correctly, they came back like new.
--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek
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