Stereo Preamplifier AA-20

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

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  • Year
  • 1961
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 367638
    • alternative name: Heath Company

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 117 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Leather / canvas / plastic - over other material
  • from Radiomuseum.org
  • Model: Stereo Preamplifier AA-20 - Heathkit Brand, Heath Co.;
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 13.125 x 3.875 x 6.375 inch / 333 x 98 x 162 mm
  • Notes

  • The Heathkit AA-20 is a vintage tube-based stereo preamplifier from the early 1960s, known for being a high-quality, low-cost "build-it-yourself" kit. It often requires modern restoration, such as replacing aged capacitors (recapping), to ensure proper functionality. It features a split volume control and mono/stereo switch.

    Key details about the Heathkit AA-20:
    Type: Tube Stereo Preamplifier.
    Era: Early 1960s (often found in 1961 catalogs).
    Key Features: Independent volume controls for left/right channels, mono/stereo mode switch.
    Restoration: Due to its age, these units frequently require restoration, including filter capacitor replacement, to function reliably.
    Status: Considered a collectible vintage audio component.

    Key Features and Specifications:
    Audio Configuration: The AA-20 is a stereo preamplifier, providing two independent channels for high-fidelity audio reproduction.
    Tube Complement: While specific tube models vary by era, these units typically utilized miniature twin-triode tubes (such as the 12AU7 or 12AX7) to provide low-distortion gain and signal processing.
    Restoration Options: Due to their age, these units are popular subjects for restoration. Complete restoration kits are available from specialty sellers like those on eBay and Reverb, providing high-quality electrolytic and film capacitors to replace aged original components.
    Documentation: Detailed schematics and assembly manuals are essential for maintaining these kits. Digital archives such as Vintage Radio Info and Scribd often host these technical documents for hobbyists.

  • Price in first year of sale
  • 34.95 USD
  • Mentioned in
  • -- Original prospect or advert (Heathkit 1961 July cat page 23)
  • Author
  • Model page created by Glen Orriss. See "Data change" for further contributors.

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