Note
QST, Aug 1967, p. 103.
QST, Dec 1969, p. 116.
QST, Apr 1974, p. 127.
QST, Feb 1979, p. 166. ("Last chance" )
The Swan Mark II linear amplifier ran 2000 watts PEP input on SSB and 1000 watts on AM and CW. It used a pair of 3-400Z triodes in grounded-grid. The 80–10 meter amplifier required an external power supply ($235.00 extra).
This is probably the amplifier Swan referred to as the "Powerhouse Mark II" in a QST ad in the Jan 1970 issue, page 121.
