[Amps] High grid current Titan 425

[Paul]

Check Q1 and D2 in the  cathode bias circuit.

de Paul, W8AEF

-----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..