MURPHY P83 'TRANSISTOR 8' (1961)

The Murphy P83 was manufactured for Fisher & Paykel Ltd by Allied Industries Ltd (Fisher & Paykel) in 1961.

8-transistor battery-portable radio, AM only

Probably available in several colours.  

Technical Information

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
STEP Sig Gen Dial Adjust for Max. Output
1 455kc 530kc 3rd, 2nd and 1st IF
2   Gang closed Repeat step 1
3 525kc Gang closed Osc. coil L2
4 1650kc Gang fully open Trimmer C8 (Osc.)
5     Repeat steps 3 and 4
6 600kc 600kc Ant coil L1 and RF coil L2
7 1400kc 1400kc (rock in) Trimmer C1 (Ant) & C4 (RF)
      Repeat step 7 or 6 & 7 as necessary

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.

1962 Murphy P83

1961 Murphy P83

1961 Murphy P83

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 broadcast band only. Dashes and spaces seem to be used in some places while not others - ie: SG1387 is the same as SG 13-87