• Country
• Australia

• Manufacturer / Brand
• Kriesler Radio Company; Newtown (Sydney)

• Year
• 1966

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 249088

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

• Number of Transistors
• 6

• Semiconductors
• AF116N AF117N AF117N AC126 AC132 AC127 OA90

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / AA: 4 x 1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 2.25 inch = 5.7 cm

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Playtime All Transistor 41-50 - Kriesler Radio Company;

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 5 x 3.3125 x 1.4375 inch / 127 x 84 x 37 mm

• Notes

• Model 41-50 is a 6 transistor portable receiver designed for broadcast band reception from 525 to 1635 kc/s. It is housed in a moulded ABS plastic cabinet.

  This is getting to be a genuine "Pocket Portable" but the pocket needs to be reasonably large.  At 5 mm square, the IF transformer cans are minute and are dwarfed by the transistors beside them. The Oscillator Coil base is, however about 11 mm square. Other miniaturization efforts include the earphone jack being the 3.5 mm variety.

  The schematic shows that the AGC line is taken off between the detector diode and the Volume Control.

  Dating is by the transistor types. No silicon transistors are used and the RF/IF transistors are the later, germanium, AF types.

  The output transistors are yoked by a copper hearsink that is close, but not touching, R25, the NTC resistor designed to prevent thermal runaway.

• Net weight (2.2 lb = 1 kg)
• 0 lb 13.5 oz (0.844 lb) / 0.383 kg

• Price in first year of sale
• 33.95 AUS $

• Literature/Schematics (1)
• J.R. Publications Transistor Radio Service Handbook (Group C5, 1968, Page K18.)

• Author
• Model page created by Brian Wilson. See "Data change" for further contributors.

• Other Models

• Here you find 895 models, 440 with images and 435 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Kriesler Radio Company; Newtown (Sydney)