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..
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