• Country
• Japan

• Manufacturer / Brand
• Sony Corporation; Tokyo

• Year
• 1978 ?

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 213706

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

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

• Loudspeaker
• - For headphones or amp.

• Material
• Various materials

• from Radiomuseum.org
• Model: Stereo Electret Condenser Microphone ECM-99 - Sony Corporation; Tokyo

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

• Notes
• Hand held one point stereo electret condenser microphone, 50 - 12.000 Hz, 2× 6,3 mm plug, ~2 years battery life time, 250 Ohm out.

• Source of data
• - - Data from my own collection

• Author
• Model page created by Sándor Selyem-Tóth. See "Data change" for further contributors.

• Other Models

• Here you find 3937 models, 3793 with images and 950 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sony Corporation; Tokyo