Note
QST, Mar 1938, p. 95. (first ad for Howard)
QST Mar 1939 page 87 (a few details)
Radio Craft, Jan 1939, p. 388. (450A)
QST, Nov 1938, p. 111. (More details)
The 450-A had 12 tubes and tuned from 0.54-65 MHz in six bands. It featured a direct-reading dial with 47 inches of electrical band spread. The SEND-RECEIVE switch was replaced by a BFO SHIFT switch, and a small circular dial was placed inside the band spread dial providing greater resolution with the band spread.
An R-meter (S-meter) was included, but the crystal filter was a ten-dollar option.
References
Brief review (450A). Radio, Jan 1939, p. 30.
