[Amps] High grid current Titan 425

[Joe Giacobello]

I am not at home right now, but if my memory serves, R117 on the bias 
board is a potential source of your problem.  I believe it's a 4.1 ohm 
or so precision resistor.  I've had it open up on a couple of occasions 
when someone gave me a bad set of 3CX800s and when I've accidentally 
overdriven the final.  The usual symptom is high grid current.

73, Joe
K2XX

On 10/27/2012 2:41 PM, Dave Hachadorian wrote:
> I have a big hand-written note in my AL-1500 manual that says "If
> metering is screwed up after an amplifier 'event,' check the
> diode that goes between B-minus and ground."
>
>
> Dave Hachadorian, K6LL
> Yuma, Arizona
>
>
> -------------------------------------------------------------------------------- 
>
> I just had an arc happen on my Titan 425 this morning that blew
> the fuses in the PS.  When I replaced them I had high voltage to
> the RF deck, but I'm seeing high grid current now with just 20 or
> so watts of drive.  Output is very low.....less then 100 watts.
> Do I have an issue with the tubes?   Thoughts?
>
> Thanks.   Rich.  N7TR
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