ORIGINAL MESSAGE:
On Mon, 30 Aug 2010 18:26:16 +0900, "Han Higasa"
<higasa@plum.ocn.ne.jp> wrote:
>
>But some authorities say one should wait until
>the entire tube being warmed up to avoid a
>mechanical stress caused by partial heat;
>larger the tube, longer the warm-up time;
REPLY:
I have never seen that in a manufacturer's data sheet. I think if it
were important the sheet would say so.
I'm speaking only of tubes normally used in amateur service. For the
really big broadcast-type tubes it may be different.
73, Bill W6WRT
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