Note
QST, Apr 1954, inside back cover.
Allied Radio catalog 1955 (copyright 1954), p. 188.
See notes from National: QST Apr 1954, p. 75.
QST, Nov 1954, p. 160. (NC-98SW, with band spread for the 17, 19, 25, 31, and 41 meter bands.)
Allied Radio catalog 1956 (copyright 1955), p. 194.
Walter Ashe catalog 1957 (probably issued in 1956), p. 2.
The NC-98 added a crystal filter, variable selectivity, and an S-meter to the basic NC-88 circuit. It had the same tube lineup and coverage. The NC-98SW model substituted shortwave-broadcast calibration for ham-band calibration on the band-spread dial.
References
Brief description. Radio News, May 1954, p. 92.
