[Amps] AL-1200 Resting Current

Dana Roode K6NR at ARRL.net
Fri Dec 12 19:08:10 EST 2003


Folks -

I finally got a chance to accurately measure the resting plate current on my 
AL-1200 (See below) - its 12ma on CW (supposed to be 40) and 88 on SSB 
(should be 150).  Does this sound like bad Zeners?

   Dana


Dana Roode wrote:
> Folks -
> 
> My AL-1200 repair efforts continue.  As you may recall, the parasitic 
> suppresser came unsoldered and I had some sort of oscillation in the 
> grid that took out the grid resistors, a resister in the grid meter, and 
> my 756ProII.  It turns out it also took out my ARB-704 relay buffer, and 
> last weekend the grid meter mechanism itself gave up the ghost.
> 
> Questions:
> - After replacing the grid resistors, the resting plate current seems 
> too low, maybe half of what it should be.  Is there an adjustment for 
> this?  I'm not sure why it would have changed.
> - I will order a new meter, should I put a diode across it to protect it 
> in the future?  What kind?
> 
>   Dana
> 
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