[Amps] Fiament watts

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Mon, 30 Aug 2010 18:26:16 +0900, "Han Higasa"
<higasa at 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