Parrot KR-4S1

• Country
• Japan

• Manufacturer / Brand
• Koyo Denki Co. Ltd.; Kodaira, Tokyo

• Year
• 1954 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 216329

• Picture
• Schematics

Previous Next

Previous Next

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

• Number of Tubes
• 4

• Valves / Tubes
• 1V6 1AH4 or 5678 1AG5 1AG4

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 45 & 1,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 2.5 inch = 6.4 cm

• Power out
• 0.4 W (unknown quality)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Parrot KR-4S1 - Koyo Denki Co. Ltd.; Kodaira,

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

• Dimensions (WHD)
• 128 x 83 x 38 mm / 5 x 3.3 x 1.5 inch

• Notes

• Koyo AM Portable Tube Radio Model Parrot KR-4S1.
  Tuning Range 540 - 1600 KC, Earphones jack. Different colours known (white, blue and red). On the sticker schematic, tube types for both, the KR-4S1 and KR-4S2 are actually: 1V6, 1AH4-sF or 5678, 1AG5-sF and 1AG4. There is an other sticker schematic which shows only the KR-4S1 with only slight differences.
  The radio is also known as Parrot KR-451, the letter S being read as a 5, which is wrong.

• Net weight (2.2 lb = 1 kg)
• 0.535 kg / 1 lb 2.9 oz (1.178 lb)

• Author
• Model page created by Franz Scharner. See "Data change" for further contributors.

• Other Models

• Here you find 55 models, 51 with images and 8 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Koyo Denki Co. Ltd.; Kodaira, Tokyo