I have a Century 21 with a drive problem. It is hard to get the full 60
watts input without drawing to much current from the power supply. I get the
hum in the side tone whenever this occurs. Also when it seems to be behaving
itself, the power output will flucuate between 30 and 15 watts, never a
steady output/input, but not a large current pull on the power supply. I
checked antenna, coax, etc to be sure I wasn't getting a mismatch. Am using
a MFJ Tuner. I think it might be associated with the power supply. The
switching transistor on the rear panel, I believe it is a 2N3055, gets really
hot. Could this transistor be the problem? Looking at the power supply
diagram, I think this is what regulates the voltage for the drive operation.
Am I on the right track? Any suggestions most helpful. 73's John KB4UTV
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