On a SB200 being driven by a Kenwood TS520S I get the following
readings on 40 meters. The amp is being run off a 120 volt
line. Plate mils 60 at rest. No-load high voltage is
2300 volts. Under load it drops to 1900. Max grid 320 mils and plate
is 350 mils under load. Cannot drive it further without exceeding
capacity of the exciter, which should be putting out 100 watts at this
time. I do not have a wattmeter.
Are tubes soft?
Is line voltage soft? I can switch to a 220 line which is
available in the shack.
Thanks for assistance. 73
George KN4AB
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