Quote:
Originally Posted by RF Burn
I thought that it was general knowledge that the characteristics of valves drift with age but especially in the first few hours of use, this being more pronounced the larger the amplification factor was?
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To me it certainly is general knowledge, but that can also be because I know that freshly mounted (picture tube) cathodes even need to go through an activation procedure including some "overvolting" to work properly at all. It makes very much sense that the first tens of hours of normal use will still see some change, especially after having been stocked for some time.
Anything with chemical or mechanical action as its main working principle that has been stocked will exhibit some changes in characteristics when first used.