• Country
• New Zealand-Aotearoa

• Manufacturer / Brand
• Cromwell, Gulbransen (NZ), Pacemaker, (Brands) Clarke, H. W.; Wellington

• Year
• 1957

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 333503

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 8

• Semiconductors
• 2N247 2N247 2N219 2N219 OC71 OC71 OC72 OC72 OA85

• Main principle
• Superhet with RF-stage; ZF/IF 455 kHz; 3 AF stage(s)

• Tuned circuits
• 8 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 6 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical

• Power out
• 0.3 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Pacemaker Transistor 8 Trans-Portable NA3201-106 - Cromwell, Gulbransen NZ,

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 11 x 8.25 x 4 inch / 279 x 210 x 102 mm

• Notes

• 8 transistor superhet with RF stage and push-pull audio output.

  The construction was typical of valve design with a chassis and the transistors mounted in sockets.

  It used eight transistors, four of European manufacture in the audio section (OC71 and OC72 types) and four American RCA transistors in the higher frequency stages (2N219 and 2N247). These RCA transistors were early “diffused field” types, developed to minimize semiconductor junction capacitance and make them suitable for RF applications. They also had a fourth connection lead, an internal screen to reduce external noise.

  Battery, 509 lantern type.

  Rola 4x6F elliptical speaker.

  TRANS-PORTABLE "The only Transistor-Portable in the world with an R.F. Stage".

  • Hear it while you travel...take it with you when you arrive! No valves...no power lead!
  • Plays for 800 hours on an ordinary 7/9d. battery!
  • No installation costs...no servicing!
  • No exterior car aerial. Special micro-iron interior aerial rejects interference.
  • No loss when you sell the car. Keep the radio!
  • At home...astonishing performance, beautiful appearance!

  Only £37-10-0 

  Part of the Transportable Series from Collier & Beale Ltd. 

  • Transistor 8 Transportable 1957 (This model)
  • Transistorised-58 Trans-Portable 1958
  • Transportable 1960 
  • Sportable 1960
  • Transportable TP63 1963
  • Transportable TP64 1964

• Price in first year of sale
• 37.50 NZ £

• Mentioned in
• NZVRS Bulletin Vol 34, No 3 2013 iii, Page 12.

• Literature/Schematics (1)
• -- Original prospect or advert (Press 31 October 1957 Page 4)

• Author
• Model page created by Martin Kent. See "Data change" for further contributors.

• Other Models

• Here you find 114 models, 110 with images and 101 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Cromwell, Gulbransen (NZ), Pacemaker, (Brands) Clarke, H. W.; Wellington