3-500's

[Brian Carling]

Ray Friess wrote:

> I'm not sure about the drive power being applied in increments... 
> However, when it comes to
> the subject of leaving the filaments on for an extended period of 
> time, I can offer a bit of advice
> from personal experience...
>
> In my case, I was getting ready to put a 30L-1 on the air (four 811 
> tubes, not the 3-500z tubes)
> and I turned on the filaments for a few minutes to check on the fan 
> operation, etc.
> I got distracted and left the shack for the night.   It was the next 
> morning when I went back down
> into the shack that I noticed the amp was still powered up.    It had 
> run in standby with the filaments
> on all night long (about 8 hours).   Nothing had gone wrong or shorted 
> or anything like that.... it was
> in perfect shape.
>
Why am I not surprised?

Where did someone get the idea that leaving tubes on or 8 hours was bad 
for them?

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