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Heathkit AA-151

Stereo Amplifier (1962)

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Heathkit AA-151


Power output: 14 watts per channel into 8Ω (stereo)

Frequency response: 30Hz to 15kHz

Total harmonic distortion: 2%

Damping factor: 10

Input sensitivity: 4mV (MM), 200mV (line)

Signal to noise ratio: 55dB (MM), 65dB (line)

Channel separation: 35dB (line)

Valve complement: 2 x 6EU7, 2 x 6AU6, 2 x 6AN8, 4 x EL84, 1 x GZ34

Dimensions: 15 x 5.25 x 11 inches

Weight: 25lbs

Year: 1962



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Reviewed Aug 21st, 2016 by thorpej

The AA-151 is a great little integrated amplifier, but it does have its problems. First of all, the phono stage is not great, and can really benefit from a DC heater supply. Second, because of the way the input selector works, line-level signals are passed through an extra amplifying stage AFTER being attenuated, resulting in unnecessary addition of noise. Some folks also have problems with the tone stack of the AA-151, but I think it performs pretty well.

If one is willing to sacrifice the phono stage and just use line-level inputs, it's possible to make some simple modifications to the AA-151 that greatly improve its performance by removing the attenuation of the line-level inputs, bypassing the extra gain stage, and reconfiguring the input selector. This is how I have mine configured, and it's a wonderful little unit... it powers some Klipsch bookshelf speakers in the master bedroom, and it sounds fantastic no matter what we throw at it.

Reviewed Feb 21st, 2015 by desertdog

Mine was pretty worn when I got it, but I still got many hours of good listening with ditton 66 speakers



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