7-transistor battery-portable radio.
Runs on 6V from 4 x D-cell batteries which are fitted to a tube and clipped into the back cover (note: green is positive, red is negative)
Valves (7 Transistor, 2 Diode): XA102, CG12E Red Spot (overload), XA101, CG12E Black Spot (detector), XA101, XB102, XB103, GET114, GET114
Intermediate Frequency: 455kc/s or 470kc/s (Check the value of C7: 480pF indicates 470kc/s and 520pF indicates 455kc/s)
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version)
A service note indicating Ediswan were no longer producing the (all PNP) transistors in this set shows that the following substitutions can be used (although these are probably no longer available either - modern versions might be found for 2N part numbers if needed)
XA101 - 2N410 or 2SA49 or 2SA53
XA102 - 2N412 or 2SA52
XB102 - 2N406 or 2N408 or 2SB54
XB103 - 2N408 or 2SB54
GET114 - 2XAC117
Service information (Murphy_P71_Transistor.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 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 appearing to contain dating info. 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)
The first digit or digits seems to reflect the number of active devices (ie: SG 14-32 has 14 transistors, SG615 has 6 valves)
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