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@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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