Stereo Preamplifier AA-20

• alternative name: Heath Company

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.

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