6-valve plus magic eye tuning, 8-band bandspread radiogram
Intermediate Frequency: 470kc/s
Frequency Bands: 8
Chassis Notes(most schematics can be clicked to download a full size version)
Service information Murphy_B301_Panharmonic_radiogram_-_6V_BS_AC_-_1957.pdf
Note: Bass boost modification in service documentation - early releases of the B301 had poor bass response.
6C9 frequency mixer is Mazda type Triode Heptode not the American 6C9 twin tetrode. https://frank.pocnet.net/sheets/196/6/6C9.pdf
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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