SR-F 21 (STF21)

• Country
• Japan

• Manufacturer / Brand
• Standard Radio Corp. (SR), Tokyo

• Year
• 1957

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 103355

• Picture
• Schematics

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

• Number of Transistors
• 6

• Semiconductors
• 2T512 2T522 2T522 2T66 2T65 2T65 1T23 1T23

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 9 Volt

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

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: SR-F 21 - Standard Radio Corp. SR, Tokyo

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

• Dimensions (WHD)
• 148 x 90 x 53 mm / 5.8 x 3.5 x 2.1 inch

• Notes

• Standard Radio AM portable radio, model SR-F21, with external speaker jack for the "HiFi Adaptor SR-EX71". An external speaker box that was sold separately.

  The two connectors between tuning dial and volume knob can be used to connect a crystal earphone MD-216. When using the upper connector the internal speaker functions simultaneously, when using the lower connector the internal speaker is switched off.

  There is also a version equipped with transistors 2T512, 2T521, 2T523, 2T66, 2T65, 2T65 and two diodes 1T23.

• Net weight (2.2 lb = 1 kg)
• 0.6 kg / 1 lb 5.1 oz (1.322 lb)

• Price in first year of sale
• 13,300.00 JPY

• Author
• Model page created by a member from A. See "Data change" for further contributors.

• Other Models

• Here you find 258 models, 245 with images and 110 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Standard Radio Corp. (SR), Tokyo