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Heathkit W-5M

Tube Power Amplifier

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Heathkit W-5M


One of the outstanding features of the Heathkit W-5M is the remarkable low frequency power response. The 0.25 watt curve extends smoothly to 3 cps and is only down 3 db at this point. Also, it is possible to obtain 20 watts of power at 20 cps without overloading.

In conventional amplifiers, low frequency response at low levels has been sadly lacking. At high levels these amplifiers tend to go into overload and block on heavy bass passages. Because of the unique output transformer design featured in the W-5M, low frequency power response is greatly improved. Special attention has been given to the problem of overload recovery.

An outstanding characteristic of the W-5M amplifier is the complete absence of the rising response at the low and high limits of the pass band which has been considered a necessary evil up to the present time. Although outside the audible range, such humps add to the instability of the amplifier and tend to create distortion in the audio range. This happens when low frequency transients, such as turntable rumble, line voltage surges or tuning thumps, drive the amplifier into low-frequency overload. In the W-5M, these transients cannot create any audible distortion and no hangover or "breathing" conditions are evident.


Power output: 25W into 8Ω (mono)

Frequency response: 20Hz to 20kHz

Damping factor: 40

Input sensitivity: 2.2V

Signal to noise ratio: 99dB

Speaker load impedance: 4Ω to 16Ω

Weight: 26.5lbs

Finish: satin gold enamel chassis, satin black cover


assembly/operation manual   English - autoteck1

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re: W-5M

I have a Heathkit W-5M I had intended to fix up 30 years ago i hate to let it go broken so I will attempt to do the slow turn on thing with a vary ac .I have though of recapping and other clean up but most people will want to put together a pair and I only have 1 so they would never match,unless I included duplicate parts ?Appreciate any opinions or suggestions thanks. zane

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