[Amps] AL80B Tube?

[R.Measures]

Hello, Brad -- My guess is that the tube has an intermittent fil-grid 
short since neg grid-I is what typically results when such a short 
occurs.  My advice is to stop pulling 10g turns while using the amp in 
aerobatic, aero-mobile service when the filament is lit.
-  Did your buddy report hearing arcing in the amp?

On Mar 4, 2005, at 9:06 AM, Brad Pioveson W9FX wrote:

> Hi, all.  A buddy has a 6 month old Ameritron AL80B.  He emailed me 
> last
> night and detailed the appearance of intermittent 175 mA Ip and 
> negative
> grid current showing up during standby conditions.  A call to 
> Ameritron for
> their thoughts on the issue this morning, he tells me, quickly 
> resulted in a
> new tube being shipped out.
>
> What's up with that?  And, does anyone know what brand of 3-500ZG's  
> MFJ is
> using these days?
>
> 73
>
>
> Brad Pioveson, W9FX
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org