Gentlemen: Trouble with my Heath SB-100, which has a 3-500Z tube.
By mistuning the unit I took out a couple of resisters and the grid
current meter in the meter circuit board. Have replaced the bad
components, and the unit tunes up OK, but when I try to drive it for just
short periods of time on CW, with a plate current of just 100 ma, the
plate gets bright red, and if I key just a bit longer there are bright
blue and white flashes in the tube, followed often by blown fuses. I
would like someone to tell me it's not the tube, but something else I can
repair-a remote chance I suppose. Any suggestions.? TIA Charlie. K0GPF
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