[Amps] Weak Amperex 3-500Z

[R L Measures]

On Jul 28, 2006, at 7:19 AM, Keith Dutson wrote:

> Last night during a weekly practice session with our ham club's small
> bluegrass band, one of the guys said he replaced the Amperex 3-500Z  
> in his
> AL-80A.  It was putting out about 400 watts CW.  He replaced with a  
> 3-500ZG
> from RF Parts and now gets 800 watts CW.  I asked what he did with  
> the weak
> tube and he went into the shack and gave it to me.
>
> Is there anything that can be done to rejuvenate the weak tube?   
> Or, is it
> just worn out?  I don't think it has ever arced over, and I can see no
> external marks on the plate.  What happens to make a tube weak?

usually loss of emission, either from running too much filament V or  
 >20,000 hours at the right fil V.
>
> Thanks in advance for all advice.
>
> 73, Keith NM5G
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org