I have an SB-200 that putting out less than expect power on 80M. Tuning
was done in accordance to Heathkit's instructions....basically for
maximum smoke and reduce the drive a bit if the grid current goes over
100mA. I expected the RF output power to be equal to or great than the
power output on 40M and 20M, and then start falling off as you go higher
in frequency. This has been my experience with other amplifiers with a
pair of 572B tubes.
The tuned input SWR on 80M is 1.2 - 1.
Drive = 100W
Any thoughts what is going on?
Band Plate V. Plate Cur. Grid Cur. Output power
80 1950 .460 .064 500
40 1950 .400 .094 675
20 1950 .400 .100 650
15 1950 .380 .100 550
10 1950 .460 .100 450
Thanks,
Ian - K8MM
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