• Country
• Netherlands

• Manufacturer / Brand
• Philips; Eindhoven (tubes international!); Miniwatt

• Year
• 1973

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 312322

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

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical

• Material
• Metal case

• from Radiomuseum.org
• Model: 4 x 6 inch Oval Standard Loudspeaker AD4681 /M4 /M8 - Philips; Eindhoven tubes

• Dimensions (WHD)
• 102 x 154 x 47.5 mm / 4 x 6.1 x 1.9 inch

• Notes

• Philips 4 x 6 inch Oval Standard Loudspeaker type AD4681 /M

  Available versions:

  • /M4:   Z= 4 Ω @ 135 Hz
  • /M8:   Z= 8 Ω @ 135 Hz

   

• Net weight (2.2 lb = 1 kg)
• 0.260 kg / 0 lb 9.2 oz (0.573 lb)

• Mentioned in
• -- Original-techn. papers. (Miniwatt Copresa "Altavoces" 1973)

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

• Other Models

• Here you find 5250 models, 4394 with images and 3450 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philips; Eindhoven (tubes international!); Miniwatt