[Amps] AL-80B Trouble

[R L Measures]

On Aug 25, 2006, at 5:17 PM, Tom W8JI wrote:

>>      ASSUMPTION:  The  3-500ZG has a short, and or the
>> tube is not receiving the proper bias voltage  during off
>> periods .  The glowing while  in standby is due to the
>> current draw across the plate; dissipating ~400W.
>
> Sounds like a grid/ filament short. As others have said,
> that was pretty common  with Amperex 3-500Z's.

Passing the buck.

>
> 73 Tom
>
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org