Note
QST, Nov 1964, p. 103.
QST, Jan 1966, p. 125.
QST, Jun 1966, p. 111. (specs and chart)
QST, Nov 1977, p. 117.
350B - unknown date to 1978: QST, Nov 1978, p. 193.
The 350D is the same as the 350B, but with digital display.
350C
QST, Feb 1968, p. 115.
QST, Jun 1968, p. 109. Discontinued in 1977.
350D
QST, Nov 1977, p. 117. (digital display) (A and D sold concurrently)
350B and 350D close out: QST, Aug 1979, p.126.
This ad references "16 years of continuous production totaling 55,000 radios." Doesn't say whether this number includes just the 350 series, or all of the tube type rigs.
