5-valve dual-wave mantle set, very similar electrically to the MD57.
Noted by John Stokes as being the last ever valve model under the Murphy brand.
Intermediate Frequency: 455kc/s most likely
Frequency Bands: 2
Chassis Notes(most schematics can be clicked to download a full size version)
Date of the MD58 set unknown, but based on MD57 schematic date of 1963 - both sets are similar electrically - probably within +/- 1 year
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 Stereo broadcast band radio only (stereo referring to the record player - radio was only mono. Dashes and spaces seem to be used in some places while not others - ie: SG1387 is the same as SG 13-87
Dating Murphy equipment is a little difficult due the codes not making much sense to the author. Here is what can be seen from the models examined:
SGx61x (ie SG615, SGD618) radiograms seem to have run from 1959 through until 1961/62 and used Garrard Type A record changers (these were released approximately 1959)