Note
QST, Oct 1972, p. 174.
QST, Jun 1973, p. 5. (good photo)
77D
QST, Jun 1975, p. 115. $2695
QST, Sep 1975, p. 119. (a few details)
QST, Jan 1976, p. 98.
77S
QST, Jan 1978, p. 159. $3895
date unknown
77DX, 77SX
QST, Feb 1979, p. 142
This is the first reference I saw, but they had probably were released earlier.
QST, Feb 1980, p. 122.
QST, Apr 1981, p. 179.
QST, Jan 1982, p, 103.
