[Amps] High grid current Titan 425

[Dave Hachadorian]

I don't know beans about the Titan 425, but isn't there a glitch 
diode, or a grid metering resistor, which, if they blow, cause 
cathode current to show up as grid current on the meter?  This 
rings a bell on my AL-1500, but I don't have time to research it 
now.


Dave Hachadorian, K6LL
Yuma, Arizona



-----Original Message----- 
From: Rich Hallman - N7TR
Sent: Friday, October 26, 2012 8:49 PM
To: amp reflector
Subject: Re: [Amps] High grid current Titan 425

Did a bit more testing.  I pulled both tubes and replaced with a 
known good 3cx800a7.  Im seeing the same problem, and looks like 
I get max grid current just by enabling the T/R circuit on the 
amp with no RF drive.  Confirmed I have HV on the tubes. I pulled 
the access cover off under the case to see the bottom of the 
tubes.  Nothing stood out as being blown.

Thoughts?

Thanks..

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Rich 
Hallman - N7TR
Sent: Friday, October 26, 2012 6:30 AM
To: amp reflector
Subject: [Amps] High grid current Titan 425

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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