Economy 7-WATT High-Fidelity Amplifier A-7D

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

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  • Year
  • 1956 ?
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 367633
    • alternative name: Heath Company

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 117 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 7 W (undistorted)
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Economy 7-WATT High-Fidelity Amplifier A-7D - Heathkit Brand, Heath Co.;
  • Shape
  • Chassis only or for «building in»
  • Notes

  • The Model A-7D amplifier honestly qualifies as a high fidelity amplifier even though it is more limited in power than other Heathkit units. It is a top value in the low priced field. This new model provides full 7-watts output. The harmonic distortion has been reduced to only 1.5% at rated output, and it incorporates an isolated ground system 10 L8S. for lower noise level. Hum is 60 db below 7 watts. Its performance is truly amazing for the price. The Model A-7D also features sealed-in-steel transformers and the output transformer is a new type incorporating a screen tap for improved performance. Frequency characteristics are  ± 1% db from 20 to 20,000 cps. Output is push-pull and top quality parts are used throughout. The output transformer is tapped at 4, 8, and 16 ohms. fication. Bass and treble tone controls are provided on the front chassis apron, and provision is made for cabinet mounting if desired. Uses a 12SQ7GT voltage amplifier, a 12SN7 tone control amplifier and phase inverter, push-pull 12A6 output power amplifier, and a 5Y3GT rectifier. 

  • Price in first year of sale
  • 16.95 USD
  • Mentioned in
  • -- Original prospect or advert (1956 Heathkit catalog page 62)
  • Author
  • Model page created by Glen Orriss. See "Data change" for further contributors.

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