Note
Concord catalog 4-46 (1946), p. 112.
QST, Oct 1945, p. 9.
Lafayette catalog number 88 (1947, copyright 1946), p. 98.
Allied Radio catalog 1951 (copyright 1950), p. 141.
QST, Jul 1951, p. 86.
Improvements. CQ, May 1959, p. 38.
Adding a product detector. CQ, Apr 1963, p. 36.
QST, Sep 1947, p. 87. (interesting photo)
Concord catalog 9-47, p. 153.
Allied Radio catalog 1952 (copyright 1951), p. 138.
Allied Radio catalog 1953 (copyright 1952), p. 37.
Key words:
HQ-129X
HQ-129
