Series 8 High Power HiFi Amplifier
This amplifier chassis was also used in the MSM16-38 Radio / Amp and the MSM12-37 Record Player / Amp
Radio / tuner information below does not apply to this model, which is just an amplifier
Valves (Solid State - Transistors):
Tuner: BF254, BC148, BF254, BF254, AA138 Diode
Amplifier: BC149C x 2, BC148C x 2, BC177B / 2N4248 x 2, 2N4074 x 2 ( 40050, 40316 Output Pair x 2)
Intermediate Frequency: 455kc/s
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version)
Service information (Murphy_MSM16-38_MSM12-37_MSM12-36_Service.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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