Tube Power Amplifier
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
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