Note
QST, Jul 1947, p. 125. (earlier than this)
QST, Aug 1947, p. 159 (DB-22A)
QST, Sep 1947, p. 159 (DB-22A, more detail)
Concord catalog 9-47, p. 151.
Lafayette catalog number 89, p 173.
Allied Radio catalog 1951 (copyright 1950), p. 143.
Allied Radio catalog 1953 (copyright 1952), p. 41.
Walter Ashe catalog, 1954, p. 5.
RME’s DB-22A preamp had continuously tunable coverage from 0.54 to 44 MHz with an average gain of 30 dB. It was self-contained with an internal power supply. Changes from the older DB-22 model included the use of 6BA6 miniature tubes.
