Note
QST, Oct 1947, p. 121.
QST, Nov 1947, inside front cover.
Lafayette-Concord catalog "1948 Christmas Book," p. 34.
See National's Notes: QST, Jun 1949, p. 73.
Lafayette-Concord (1949 #949), p. 144.
Allied Radio catalog 1951 (copyright 1950), p. 140.
QST, Mar 1951, p. 97. ("last call")
The NC-57 had a wide tuning range which extended from 0.54-55 MHz. The nine-tube receiver had a built-in loudspeaker and AC power supply. Accessories for the NC-57 included the SM-57 external S-meter and a tilt-up base.
Most changes in the NC-57B from its NC-57 predecessor were minor. Among them was rewiring the accessory socket for National’s Select-O-Ject. The regulator tube was changed from an OD3 to a VR-150.
