Note
QST, Aug 1955 p. 103. "Coming next month"
QST, Sep 1955, p. 87. With specs.
Walter Ashe catalog 1957 (probably issued in 1956), p. 7.
Allied Radio catalog 1957 (issued 1956), p. 245.
Allied Radio catalog 1958 (copyright 1957), p. 273.
Has an optional tilt-base power supply similar to the RAP-250-S, but without speakers. Seen in this photo: QST Apr 1956, p. 97.
Date of introduction of the MB-560-A is unclear. Morrow's advertising for all of 1956 never refers to the 560-A. But a QST review in November 1956 means the "A" version must have been released a couple of month earlier, probably September. The difference between the 560 and the 560-A appears to be greater TVI protection.
Mobile use requires the optional RVP-250 vibrator power supply.
Review (MB-560A): QST, Nov 1956, page 40.
Review (MB-560): CQ, Nov 1956, page 52.
