Note
QST, Oct 1936, p. 127.
QST, Dec 1937, p. 129.
Lafayette catalog number 78, p. 145.
QST, Nov 1945, p. 127.
Lafayette catalog number 88 (1947, copyright 1946), p. 98.
RME designed its tunable preselector to match the Model 69 as well as the older RME 9D receivers, although it would work with other brands as well. The DB-20 covered 0.54–32 MHz, providing increased sensitivity and image rejection for the host receiver. The unit had an internal power supply and used two tubes plus a rectifier.
