>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.
** What is the marked resistance of the 15k-ohm R? Is the meter
movement associated with it still good?
>
>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.
** Sounds like it.
cheers, 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)?
>>
>> Dana
>>
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>
>
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