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 sold as a kit for hobbyists. It does the amplifying and the passive preamp job in one chassis, with vacuum tubes. It puts out 25 hi-fi-rated watts. Four front-panel inputs are switch-selected, so you can hook up several audio sources. Bass and treble tone controls are separate. The front panel is charcoal and ivory.
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 tube lineup includes 7591 power tubes and a 12AU7. The schematic is the same as the Heathkit AA-23, so the two models share a circuit. The AA-181 is called an integrated amplifier, but the preamp section is passive. That means no active amplification stages in the preamp.
Context
The Heathkit AA-181 replaced the A-9C amplifier in the Heathkit lineup.
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