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AA-151 Stereo Amplifier

AA-151 Stereo Amplifier


  • 28 hi-fi rated watts (14 per channel)
  • Stereo or Mono operation
  • 4 stereo inputs
  • 6 versatile controls
  • Matches the AJ-11 Tuner perfectly

The Heathkit AA-151 is a new and elegantly-styled stereo amplifier. With the features of units selling for twice the price, the AA-151 is really the leader of the medium price class in combination amplifiers and preamplifiers. This rugged unit delivers a full 28 watts, High Fidelity rated (14 watts per channel).

With its handsome luggage tan vinyl-clad steel cabinet and charcoal grey front panel, it blends perfectly with the AJ-11 AM/FM Tuner. Outstanding in quality and flexibility, the AA-151 has fingertip controls that give instantaneous command over every function. A four input selector switch provides choice of magnetic phono, crystal phono, tuner or high level auxiliary input for tape recorder, TV, etc.

AA-151 Internal View

This 28-watt beauty is good looking inside too! See how Heath engineers have combined skillful layout with dependable components—all in an easy-to-assemble product which will give you years of faithful service at savings of 50%.

The six-position function selector switch gives you instant selection of either the left or right stereo signals independently or through both amplifier channels. It also selects 'Stereo' or 'Stereo Reverse' providing channel reversing function. A dual-concentric volume control incorporates a friction clutch which locks the volume controls together once the balancing of the output levels of the two amplifiers has been accomplished. Ganged dual tone controls adjust bass or treble response of both channels simultaneously. Proper speaker phasing is conveniently accomplished with the speaker phase-reversal switch. Each channel is equipped with a filament balance control. Two AC outlets, one controlled by the power switch, the other unswitched, provide convenient accommodation for accessory equipment. The husky power supply which employs a GZ34 rectifier tube, provides the voltage regulation essential for high power output, while maintaining low distortion levels.

With this remarkable AA-151 Stereo Amplifier and the AJ-11 AM/FM tuner you will have a powerful stereo combination for your home system at a budget-conscious price. The AA-151 and the AJ-11 are look-alike companions designed for each other with styling that will blend with any decor in your home.

SPECIFICATIONS—Channels: 2. Power output: 28 watts (14 w. per channel) Heath Hi-Fi Rating; 32 w (16 w. per channel) IHFM Music Power Output (0.7% THD, 1kc.) Power response: ± 1 db from 20 cps to 20 kc at 14 watts output per channel. Harmonic distortion: Less than 2%, 30 cps to 15 kc at 14 watts output per channel. Intermodulation distortion: Less than 2% at 14 watts output per channel using 60 cps and 6 kc signal mixed 4:1. Hum and noise: Mag. phono input, 55 db below 14 watts; Tuner and crystal phono 65 db below 14 watts. Channel separation: Better than 45 db. Input sensitivity: For 14 watt output each channel (tone controls in "Flat" position): mag phono, 0.004 volts at 1 kc; crystal phono, 0.2 volts; tuner and aux., 0.2 volts. Outputs: 4, 8 and 16 ohms. Damping factor: 10:1. Controls: Dual clutched volume, ganged bass, ganged treble; 4-position source selector; 6-position mode selector; speaker phasing switch. Tube complement: 2-6EU7, 2-6AU6, 2-6AN8, 4-EL84/6BQ5, 1-GZ34/5AR4. Power requirements: 117 v. 50-60 cycles, 130 watts. Power outlets: 2 AC receptacles, 1 switched, 1 unswitched. Dimensions: 15¾" W. x 5¼" H. x 11" D. Shipping Weight: 27 lbs.

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