Note
QST, Jul 1952, inside back cover.
See notes from National: QST, Aug 1952, p. 71.
Allied Radio catalog 1953 (copyright 1952), p. 37.
QST, Apr 1954, p.111.
QST, Nov 1954, p. 160. (NC-98SW, with band spread for the 17, 19, 25, 31, and 41 meter bands.)
Walter Ashe catalog 1957 (probably issued in 1956), p. 2. (list of coils)
QST, Nov 1958, p.199.
QST, Jan 1960, p. 145.
QST, Dec 1963, inside back cover.
QST, Jan 1964, inside back cover.
QST, Oct 1964, p. 111. (note the "In recent years..." comment)
HRO-60T — tabletop
HRO-60R — rack mounted
The HR0-60 was the final vacuum tube HRO. It broke new ground as the long-running receiver series continued to evolve. It introduced double conversion to the HRO line and used 18 tubes. Ten coils gave it a 50 kHz to 54 MHz tuning range. Matching speaker is the HRO-60TS (table top). Also available in rack mount as the HRO-60RS.
References
Making 15 Meter Coils. CQ, Jan 1964, p. 52.
