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813 warm up time
COLIN LAMB wrote:
Finally Eimac called him and learned that the chap was turning the tube filaments off between transmissions and turning them on immediately before each transmission. So, do not use either tube for break in cw by keying the filament. 73, Colin K7FM I have to wonder what the keying waveform might have looked like. Probably added a unique sound to his signal. Something like a modified banana-boat swing, for lack of a better description? de K3HVG |
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