Quote:
Originally Posted by 65flh5326
I dont know if this is relative to amplifiers. I have used metal cutting lathes that have tube controlled DC variable speed drives.
Upon start up, the main power connector is engaged, the tube filaments are warmed by timer for one minute, then the control button lights and the machine can be set in motion.
In practice, if the machine has set unused for a period of time, the tubes should be at standby for 15 minutes. The thought is, some of the gas in the tubes can turn to solid, by warming them, the gas in the tube is restored.
Experience has shown that to be true, as cold starting reduces tube life. Also its well known that if the machine is to be used off and on through the day, its better to leave the machine on standby rather then cold start it for each use.
Retail price for the 3 power tubes is $4100, but if lucky, they can be found for $750 each for the two beer bottle sized ones.
Since using these machines for 35yrs, I have done the same start up with my tube amplifiers with great results, I seldom have had problems.
Thanks,
Don
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Were those by any chance Mercury Vapor rectifier tubes?
I know a lot of audiophile guys use those and are extremely careful to allow proper warmup before use. Seems I read a couple threads where guys had exploded them by starting them cold. Mercury is not exactly something you want leaking in your home or workplace.