------------ ORIGINAL MESSAGE ------------(may be snipped)
On Thu, 15 Feb 2018 21:23:37 +0000, K5AM wrote:
>
>Bill, the amplifier was built in 1971, and ran with the
>first tube for 17 years. That tube still ran perfectly,
>but I had a few spares on the shelf, and read
>somewhere that it was good to rotate them, for
>gettering. So I began to rotate tubes about every five
>years.
REPLY:
Very interesting. Thanks, Mark.
73, Bill W6WRT
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