Stereo-4 Decoder (Quadraphonic Matrix Decoder) AD-2002

Heathkit (Brand), Heath Co.; Benton Harbor (MI)

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  • Year
  • 1972
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 367701
    • alternative name: Heath Company

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 110-120 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Stereo-4 Decoder AD-2002 - Heathkit Brand, Heath Co.;
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 5.23 x 2.5 x 7 inch / 133 x 64 x 178 mm
  • Notes

  • The Heathkit AD-2002 is a Stereo-4 Decoder (quadraphonic matrix decoder) originally released in the early 1970s.

    Heathkit AD-2002 Overview:
    The AD-2002 was designed to decode matrix 4-channel quadraphonic sound, specifically the Stereo-4 (EV) system developed by Leonard Feldman and Jon Fixler. 
    Function: It allowed users to convert a standard 2-channel stereo signal into a 4-channel quadraphonic experience. 
    Kit Format: Like most Heathkit products, it was sold as a kit for hobbyists to assemble themselves, complete with a detailed assembly manual. 

    Availability: Today, these units and their original manuals are popular items on eBay and other vintage electronics marketplaces.

    AD-2002 SPECIFICATIONS: Gain (control maximum): Unity. Maximum Input Signal: 2.5 V RMS. Frequency Response: 10-100,000 Hz; +0, —.5 dB. Signal to Noise Ratio, (referred to .25 V input): Greater than 70 dB, wideband. Total Harmonic Distortion, (at .25 V input): Less than .15%. Intermodulation Distortion, (at .25 V input): Less than .25%. Input Impedance: 50,000 ohms minimum, Output Impedance: 3,000 ohms. Controls: Master Gain/Power On-Off, Function Switch. Power Requirements: 110-120 V, 50-60 Hz; 3 watts.

    Kit AD-2002, Decoder plus six 4’ audio cables and 33% RPM demonstration record.

     

     

  • Price in first year of sale
  • 29.95 USD
  • Mentioned in
  • -- Original prospect or advert (Heathkit 1972 810-72 cat page 19 "New")
  • Author
  • Model page created by Glen Orriss. See "Data change" for further contributors.

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