Note
QST, May 1947, p. 91.
QST, Aug 1947, p. 88. (Interior image)
QST, Sep 1947, p. 87. (interesting photo)
Concord catalog 9-47, p. 153.
QST, Mar 1948, p. 110. ("prices slashed")
QST, Mar 1950, p. 101.
Officially "Four-11,” though advertising often used “4-11.”
A companion for the 4-20 transmitter.
Later offered as a kit for $29.50. See QST, Dec 1948, page 93.
References
Technical description. Radio News, May 1947, p. 44.
