Rod Elliott wrote:
>
> Five months ago I bought a new Ameritron AL-80B/X (/X=the export version:
> 240-volts with 12 and 10m enabled). Unfortunately, so far, two 3-500Z?s
> (Amperex) have failed with grid-filament shorts.
I think the AL80B is a decent amplifier design; I do not believe there is either
an inrush or parasitic problem. And it may be the only game in town at this
price point for a new amplifier. I suspect tube problems (it's quite common to
get a run of bad tubes). I would try an RF Parts brand 3-500Z
<http://www.rfparts.com/>.
An excellent 1 KW amp is the Acom 1000. But the price is much higher than the
AL-80B. <http://www.hfpower.com/>.
Good luck
Vic K2VCO
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