Hi,
I recently picked up a used AL-1200. I tried to tune up the amp, on 160
meters, and have a problem. I am using a TS-2000 as a driver and reduced the
power, in the AM mode down to 5 watts. I did this to sneak up on the input
power. I slowly brought up the power until I saw some grid current. I put the
meter in the power output position and adjusted the Plate and Load controls. I
only get a small amount of rf output. I raised the input power to 25 watts and
still don’t see more than around 100 watts output. The input swr is 1.1 – 1,
grid current 70 ma, plate current 300 ma. The plate current varies a small
amount when the Plate or Load controls are adjusted. It appears that it's way
out of resonance.
I checked all of the padding caps in the circuit and they all measured in spec.
I took a look at the bandswitch contacts and they all look okay.
Has anyone had this problem on 160 meters?
I also have a question on the inrush relay K3. It seems that, during power up,
K3 is only on for around .5 seconds. Is this normal?
Thanks,
73, Lloyd K8DIO
Twinsburg, Ohio
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