Mingay's "Radio Diagram & I.F. Index

There were 3 Editions.

The first edition was printed in 1940 for 2/6, and edited by O.F. Mingay and a Mr. Edwards. It provided an index to finding the circuit diagrams of radio receivers that had been published in other Mingay magazines
and the AORSM books (see entry for AUSTRALIAN OFFICIAL RADIO SERVICE MANUAL) for the period 1933 to 1939.

A second edition was published in 1941 and following the end of World War 2 a 3rd edition was produced in 1947 which deleted some of the early listings but included sets up to 1945.
The 1947 edition cost 5/- and provided data on the I.F.'s (Intermediate Frequencies) of some 2,600 wireless sets going back to 1936, as well as a comprehensive index of manufacturers' models and where to find the circuit diagram for each set in the AUSTRALIAN OFFICIAL RADIO SERVICE MANUALS. (thanks to Gary Cowans for input)