QST, Nov 1978, p. 190.
QST, Jan 1980 p. 144.
The Swan 1200Z amplifier used four 6MJ6 tubes in parallelfor 1000 watts PEP input on SSB, and 750 watts DC input on CW. The 1200Z had a self-contained power supply, and its tuned input made it easy to use with solid-state rigs.
