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Heathkit W-4AM

Tube Power Amplifier

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Heathkit W-4AM


In the past four years, literally thousands of people have built and used Heathkit Williamson-type amplifiers.

They represent a large majority of the units of this type now in use throughout the audio-conscious world.

The Heathkit model W-4AM Amplifier incorporates all the worthwhile improvements and modifications resulting from this unequalled background.

The Heathkit W-4AM is capable of placing the burden of proof on the most elaborate and expensive speaker systems available today.

Unless you have, or expect to have, more than $300.00 to spend for a loud-speaker system, no significant improvement would be audible if the W-4AM were replaced with any other commercially available power amplifier, regardless of price.

If more elaborate reproducers were used, some improvement at extremely low frequencies might be expected through the use of amplifiers such as the Heathkit W-5M.


Power output: 27W into 8Ω (mono)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 1.4%

Damping factor: 28.5

Input sensitivity: 2V

Signal to noise ratio: 95.2dB

Speaker load impedance: 4Ω to 16Ω

Dimensions: 15-1/4 x 8-7/8 x 7 inches

Weight: 23.25lbs



This website is not affiliated with or sponsored by Heathkit. To purchase W-4AM spares or accessories, please contact the company via their website or visit an authorised retailer.