Note
QST, Feb 1971, p. 107.
QST, Aug 1971, p. 109.
QST, Oct 1972, p. 145.
QST, Jan 1973, p. 109.
Swan’s Mark 6B linear amplifier ran 2000 watts PEP input on 6 meters. The power supply was a separate, matching unit. The Mark 6B used a pair of 3-500Z triodes in grounded grid. It required 100 watts drive for maximum legal input.