Note
QST, Feb 1966, p. 121.
QST, May 1967, p. 123.
QST, Jan 1968, p. 139.
QST, Apr 1969, p. 119.
QST, Jul 1969, p. 125. (Duo Bander II)
The Duo-Bander II worked lower sideband on 80 and 40 meters. It was rated at 400 watts PEP input. The transistorized VFO tuned the phone portions of both bands. It had a built-in speaker.
References
Review: CQ, Sep 1966, p. 26.
Short review: Popular Electronics, Oct 1966, p. 91.