• Country
• Japan

• Manufacturer / Brand
• TTM Electronics Corporation; Tokyo

• Year
• 1977 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 298657

• Number of Tubes
• 1

• Valves / Tubes
• 75AWB31

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Line plus power jack, mostly with battery or storage battery / AC: 90-130; 180-260 / DC: 11-30 / internal battery 12 V Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Dual trace oscilloscope 303 - TTM Electronics Corporation;

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

• Dimensions (WHD)
• 223 x 112 x 298 mm / 8.8 x 4.4 x 11.7 inch

• Notes

• See similar model TTM 303A  with sweep time up to 0,5 μS and chopped mode

• Author
• Model page created by Miguel Bravo-Cos. See "Data change" for further contributors.

• Other Models

• Here you find 2 models, 2 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from TTM Electronics Corporation; Tokyo