Note
QST, Dec 1954, p. 4 "coming soon"
QST, Oct 1955, p. 7. (10 months later...)
Allied Radio catalog 1956 (copyright 1955), p. 192.
CQ. Oct 1956, p. 15.
QST, Jan 1957, p. 7. (general info)
The HT-30 had band-switching coverage of 80, 40, 20, and 10 meters but skipped 15. The 22 tube transmitter used a 50 kHz filter for sideband generation. SSB and CW output from the pair of 807 finals was 35 watts.
References
Brief technical description. Radio News, Oct 1955, p. 70.
Add a frequency shift keyer. CQ, Apr 1964, p. 34.