To: | AMPS <amps@contesting.com> |
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Subject: | Re: [Amps] AL-1200 Grid Current - negative? |
From: | Dana Roode <K6NR@ARRL.net> |
Date: | Sun, 09 Nov 2003 11:36:49 -0800 |
List-post: | <mailto:amps@contesting.com> |
Amps folks - Ok, I removed the tube and the meter still went negative. I checked the filament connections with the tube out, nothing is shorted to ground. I was suspect of the metering circuit itself. The left multi-function meter measured 300 ohms across the terminals, the right grid meter measured 15k. The parts list indicates both meters are 300 ohm 1ma. I took the grid meter apart, it has a component (a precision resister, I assume) in series with each internal meter movement lead. One measured 100 ohms, the other about 15k. I am pretty clueless about this, and Im at a loss as to why a 100ohm resister would become 15k, but perhaps this is my problem. Dana Dana Roode wrote: What does it mean when you power up an AL-1200 and the grid current meter pins negative (no drive power supplied)? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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