Note
QST, Apr 1979, p. 135.
QST, Jan 1980 p. 144.
QST, Apr 1981, p. 183.
The Swan 1500Z used a pair of 572B tubes for 1500 watts input. It had a tuned input, self-contained 110/220 VAC power supply, and covered 80–15 meters. The panel meter showed relative output, plate current, or plate voltage.