Intermediate Frequency: 455kc/s
Frequency Bands: 4
Chassis Notes(most schematics can be clicked to download a full size version) Broadcast band + 3 SW bands. Typically wired for EM81 eye, but could be EM85 - replace like for like or rewire to suit.
Service information (Murphy_MA75_New_Metropolitan_-_6V_BS_AC_-_1960.pdf) here
General Construction Notes for Allied Industries Ltd (Fisher & Paykel):
Murphy stereogram model prefix indicates radio bands - ie: SGA is Stereogram All-Wave, SGD is Stereogram Dual-Wave. SG means broadcast band only. Dashes and spaces seem to be used in some places while not others - ie: SG1387 is the same as SG 13-87