MURPHY SGA12-31 (CIRCA 1965)

The Murphy SGA12-31 was manufactured for Fisher & Paykel Ltd by Allied Industries Ltd (Fisher & Paykel) in about 1965.

Solid State Stereogram with 12 transistors.  4 band reception.

Cabinet designed and built by G. C. Goode in Auckland.

Technical Information

Valves (12 transistors, 3 diodes): AF136, AF136, 2N1524, 2N1524, AA111 Diode, 2N2613, 2N2613, 2N2953, 2N2953, 40050, 40050, 40050, 40050 and 2 x 40266 Rectifier Diodes

Frequency Bands: 4

Chassis Notes(most schematics can be clicked to download a full size version)

Service information Murphy_SG1230_and_SGA1231_schematic-converted.pdf


Note: the following schematic image is too detailed to fit neatly on the site, so if you need to be able to zoom in on details then download the PDF above and zoom to your hearts content :) 1968 Murphy SGA1231

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)