• Country
• Japan

• Manufacturer / Brand
• Panasonic, Matsushita, National ナショナル (also tubes); Osaka

• Year
• 1958 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 254811

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

• Number of Transistors
• 7

• Semiconductors
• OC44 or. MC101 OC44 or. MC101 OC45 OC45 OC71 OC72 OC72 OA70 MA23

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

• Wave bands
• Broadcast and Short Wave (SW).

• Power type and voltage
• Dry Batteries / 4 x 1,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 6.6 cm = 2.6 inch

• Power out
• 0.13 W (0.2 W max.)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: National 2 Band Transistor 7 AB-175U - Panasonic, Matsushita,

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

• Dimensions (WHD)
• 170 x 98 x 45 mm / 6.7 x 3.9 x 1.8 inch

• Notes

• Frequency range:
  MW 540 - 1600 kHz
  SW 3.9 - 10 MHz

  Transistor MA23 is used as a diode bias stabilizer in the audio output amplifier.

• Net weight (2.2 lb = 1 kg)
• 0.5 kg / 1 lb 1.6 oz (1.101 lb)

• Mentioned in
• -- Original-techn. papers.

• Author
• Model page created by Daniel Rosha. See "Data change" for further contributors.

• Other Models

• Here you find 2987 models, 2764 with images and 620 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Panasonic, Matsushita, National ナショナル (also tubes); Osaka