• Country
• United States of America (USA)

• Manufacturer / Brand
• Heathkit (Brand), Heath Co.; Benton Harbor (MI)

• Year
• 1957 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 164095

• • alternative name: Heath Company

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 5

• Valves / Tubes
• 6SN7GT 6SN7GT 5881 5881 5V4G

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 105-125 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 20 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Williamson Type Amplifier W-3AM - Heathkit Brand, Heath Co.;

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 5.5 x 7 x 11 inch / 140 x 178 x 279 mm

• Notes

• Heathkit Amplifier W-3AM.  Mono audio amplifier consisting of a amplifier chassis and power supply chassis.  The Heathkit sold the W-3A kit (69.95 USD), which consisted of the W-3AM amplifier and the WA-P2 preamp.

• Net weight (2.2 lb = 1 kg)
• 11.4 kg / 25 lb 1.8 oz (25.11 lb)

• Price in first year of sale
• 49.95 USD

• Source of data
• -- Original-techn. papers.

• Literature/Schematics (1)
• -- Schematic (Heathkit Catalog 1958 page 8.)

The Williamson Amplifier, an article from the inventor D.T.N. Williamson, published in Wireless World, England as a collection of Articles on "Design for a High-quality Amplifier". Charles Truscott, Cape Town, South Africa, has sent us the scan and Thomas Günzel, Ulm, Germany, has made the big effort to draw all pictures again and to digitalize the articles fully. One could say that without the inventions Williamson did, modern Hi-Fi would not be possible - here is all about it.

2764 KB

• Documents regarding this model

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 717 models, 700 with images and 507 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Heathkit (Brand), Heath Co.; Benton Harbor (MI)