The N.Z. Vintage Radio Project

Valves (8 Transistor, 2 Diode): 2SA92, 2SA52, 2SA49, 2SA53, 1N60, 1N60, 2SB54, 2SB54, 2SB189 + 2SB189 Push-Pull Output

Frequency Bands: 1

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

Murphy P83 Transistor Radio Alignment Procedure

• Set volume to max., connect meter across speaker voice coil or collectors of output transistors.
• Use ant and gnd terminals for signal injection

Alignment Notes:

• If a sweep gen is available for steps 1 & 2, a more symetrical IF curve will be obtained and better audio quality will result.
• Step 6 should only be used if the antenna coil appears to have moved on the rod or if a new coil has been fitted.
• Moving the coil on the rod along with rocking in the tuning condenser around 600kc will peak the signal
• Total no-signal current drain should be 14mA with the volume control in the minimum position.

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)