QST, Aug 1966, p. 7.
The SBX-9 was a 9 MHz filter-type SSB generator sold by the International Crystal Mfg. Co. It provided sufficient drive for a transmit mixer such as ICM’s SBA-50. The SBX-9 came equipped with upper and lower sideband crystals.
See also CQ, Nov 1966, p. 112.
