Lee -
That sounds about right for the T-4XC.... Remember, this IS AM! About 20W output is typical, you
only want about 150 mA on voice _peaks_, or about 50W out.
You can swap out V7, and check the value of R63, but it doesn't sound out of line. Of course it HAS
been about 35 years since I tried this, so ....
The current on the L-4B is definitely too high though. The L-4B should be about 30 dB gain, so your
15 W of drive should result in about 150W out of the L-4B and roughly 175 mA of plate current.
Perhaps there is someone around who has done this more recently???
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
kc9...@aol.com wrote:
Hi gang...
Using the T-4XC and L-4B on AM for the first time tonight..CAREFULLY.
OK, tune up good, go to AM have about .12 amps plate current at idle .... and 15 watts out with
NO Mic input.
Seems a little high?
Also, with that scenario...I get 350 MA idle plate current on the L-4B with no Mic input...seems
high??
73,
Thanks,
Lee
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