[Amps] High grid current Titan 425

[Rich Hallman - N7TR]

Ill check that out as well.  I just replaced the full bias board with a spare I had and is working now.  So its off to find the bad part.

Thanks..

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Joe Giacobello
Sent: Saturday, October 27, 2012 11:50 AM
To: Dave Hachadorian
Cc: amps at contesting.com
Subject: Re: [Amps] High grid current Titan 425

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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