• Country
• Japan

• Manufacturer / Brand
• Pioneer Corporation; Tokyo

• Year
• 1982 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 162091

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 12 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 20 W (40 W max.)

• Material
• Metal case

• from Radiomuseum.org
• Model: Stereo Main Amplifier GM-4 - Pioneer Corporation; Tokyo

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 150 x 25 x 153 mm / 5.9 x 1 x 6 inch

• Notes

• In-car Stereo Amplifier. Continuous output power 30-20,000Hz 10 + 10 watts into 4 ohms, maximum total harmonic distortion no more than 0.8%. Maximum output power 20 + 20 watts, audio frequency response: 30-30,000Hz ±3dB.

• Net weight (2.2 lb = 1 kg)
• 1 kg / 2 lb 3.2 oz (2.203 lb)

• Mentioned in
• -- Original prospect or advert (Italian: "Quattroruote" September 1983.)

• Literature/Schematics (1)
• - - Manufacturers Literature (Service manual Pioneer GM-4 dated Oct 1982)

• Author
• Model page created by Fabio Masetti. See "Data change" for further contributors.

• Other Models

• Here you find 1140 models, 1125 with images and 200 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Pioneer Corporation; Tokyo