Heathkit AA-181
A mono integrated tube amplifier kit with 25 hi-fi-rated watts and four switchable front-panel inputs.
Overview
The Heathkit AA-181 is a mono integrated amplifier designed as a kit for hobbyists. It combines amplification and passive preamplifier functions in one unit, using vacuum tube technology. The amplifier delivers 25 hi-fi-rated watts and features four front-panel switch-selected inputs, allowing connection of multiple audio sources. It includes separate bass and treble tone controls for sound shaping. The front panel has a distinctive charcoal and ivory color scheme, giving it a clean, classic mid-century aesthetic.
Specifications
| Power output | 25 hi-fi-rated watts |
| Inputs | Four front-panel switch selected inputs |
| Tone controls | Separate bass and treble tone controls |
| Front panel appearance | Smart charcoal & ivory |
Design
The Heathkit AA-181 uses vacuum tubes in its design, including 7591 power tubes and a 12AU7 tube. It shares the same schematic as the Heathkit AA-23, indicating a direct circuit relationship between the two models. Though described as an integrated amplifier, it was designed with a passive preamplifier section, meaning it does not include active amplification stages in the preamp.
Context
The Heathkit AA-181 replaced the A-9C amplifier in the company's product lineup, continuing Heathkit's tradition of offering high-quality audio kits for home assembly.
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