[Amps] High grid current Titan 425

[Rich Hallman - N7TR]

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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