Note
QST, Jul 1973, p. 133.
QST, Mar 1974, p. 113.
QST, Feb 1975, p. 107.
Last actively advertised in 1975, but in QST Oct 1978, page 188, Communications Technology Group advertised the receiver as available in "factory sealed boxes" as "brand new." So these are probably new old stock they acquired from the liquidation of Ht-Gain??