3-500's

[Lee Boulineau]

It may be that thoriated tubes can't handle it?!?

Lee N4MVL


> > 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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