Grid current with no drive isn't normal. It isn't a question of bias. Try just shorting
the amp key line without the transceiver connected. If you get some grid current, either
the amplifier is unstable (unlikely) or a tube is going bad.
Probably you will not see any, which implies that the grid current was caused by the
transceiver generating some RF -- possibly from hum, etc.
On 9/25/2012 5:35 PM, Mark Robinson wrote:
I noticed today on my TenTec Titan 425 that the grid idle current is around 7
or 8mA on
the Ig meter. I see this on the amp when I key my TS930S in ssb with no drive.
(modulation). I don't recall seeing this before. Is this normal or is there a
bias
issue that I should look at?
73 Mark N1UK _______________________________________________ Amps mailing list
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Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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