• Country
• United States of America (USA)

• Manufacturer / Brand
• Triad Magnetics Inc.; Corona, CA

• Year
• 1955 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 361184

• Number of Tubes
• 5

• Valves / Tubes
• 6SN7GT 6SN7GT KT66 KT66 5U4G

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

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

• Power out
• 22 W (undistorted)

• Material
• Metal case

• from Radiomuseum.org
• Model: Williamson-type Amplifier HF-18A - Triad Magnetics Inc.; Corona,

• Shape
• Chassis only or for «building in»

• Notes

• Power amplifier, mono; may be used as an all-triode amp with 16.5 W output, or in Ultra-linear mode with 22 W.

• Net weight (2.2 lb = 1 kg)
• 22 lb (22 lb 0 oz) / 9.988 kg

• Price in first year of sale
• 77.40 $

• Mentioned in
• -- Schematic

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

• Other Models

• Here you find 4 models, 4 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Triad Magnetics Inc.; Corona, CA