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In Reply to: RE: Ralph, What about my 7241s? posted by pictureguy on May 23, 2020 at 18:55:56
Well actually, the goal is to condition the filaments before you apply B+ from plate to cathode. So while you are applying B+, the filaments are having to do their job of producing electrons, and therefore at least in theory they are not ".conditioning".That's the way I think about it. It's kind of like letting your car idle until the oil and water warm up sufficiently before asking it to perform at a high-level. I could be off base. But in researching this topic online, and with respect to a generic triode, the recommendation of another expert was 5 to 6 hours. But Ralph has vast experience with the particular power triodes used in his amplifiers, and I have no doubt that his recommendation to do it for 4-5 days is based on his long-term results. My question is whether that applies to the type 7241 power triode, which can pass many times more current than a 6AS7.
Follow Ups:
I have no idea what that means, but if it makes you happy, carry on.
The metals from which the various conductive parts of a tube are made MAY benefit in some fashion, perhaps increase lifetime, from the stress relief of heating and cooling, but I have not idea.
Also? once the getter has done its work and the vacuum in the tube is as good as it will get, than THAT should be it on that front, too.
Too much is never enough
I have no dog in the fight for filament conditioning. You asked a question and I tried to respond based on my own poor understanding. This is the sort of topic where even EEs might disagree.
The vacuum tubes I currently own, and I DO have a few, are in a 1950s Zenith Trans Oceanic Radio.
And they are difficult to source tubes, I'm told. But also last 'forever'.
I'd love for an EE to weigh in. Lot's of points in modern hi-end audio which are less than accessible to many people. And I think works to the detrement of the hobby as a whole when somebody goes to a store and is told they need XX for cables and the tubes in the amp 'are OK' and 'you should upgreade them ASAP'......
I'd love to compile a list....
Too much is never enough
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