[Amps] AL-1200 Questions

[R.Measures]

>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?  

**  Not unless you use a string of forward biased Si diodes instead of 
the zener.  .

>I'm not sure why it would have changed.

**  the meter accuracy have been compromised.  I would check the accuracy 
with a DMM and a low-V supply.

>
>- I will order a new meter, should I put a diode across it to protect it in 
>the future?  What kind?
>
**   2, parallel 3A Si rectifiers, back to back