Note
QST, May 1957, inside back cover.
QST, Aug 1957, inside back cover. (specs)
Allied Radio catalog 1958 (copyright 1957), p. 267.
Allied Radio catalog 1959 (issued in 1958), p. 374.
Allied Radio catalog 1960 (copyright 1959), p. 391.
The NC-188 was a general-coverage receiver with calibrated band spread for the 80–10 meter amateur bands. The nine-tube set covered 0.54 to 40 MHz in four bands.