12 Watt Driver Amplifier 139-A

Lafayette Radio & TV Corp; New York (NY)

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  • Year
  • 1936
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 371040
    • alternative name: Wholesale Radio

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 110-120 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Power out
  • 12 W (undistorted)
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: 12 Watt Driver Amplifier 139-A - Lafayette Radio & TV Corp; New
  • Shape
  • Rack
  • Dimensions (WHD)
  • 19 x 8.75 x 7 inch / 483 x 222 x 178 mm
  • Notes

  • The driver amplifier ilustrated at the right was especially designed to work with the 100-watt amplifier (138-A). The circuit employed uses six tubes, providing a gain of 80.7 db. Overall gain of driver and power stage is 95 db. Tubes used include 2-56,s 1-53, 2-2A3's and 1-5Z3 rectifier. Hum level (combined driver and power stage) is -50 db below 100-watts output. The driver amplifier has a high-impedance input of 500,000 ohms, and is especially designed for use with multi input mixers such as the one shown with the 100-watt system listed on page 17 (see page 28 for additional listing of electronic mixers and preamplifiers). A master gain control, with graduated dial, is mounted on the front panel along with a full range tone control. Tone control limits high-frequency response to suit individual requirements of the installation. A jeweled pilot light is furnished for "on-off" indication. Chassis and panel are finished in rubber black lacquer. 

    Model 139-A   Lafayette 12-watt high fidelity driver for use with the 100-watt amplifier, less tubes. For standard rack mounting. Dimensions: 7" deep. 19" wide, 8¾" high overall. For 110 volts, 50-60 cycles A.C.

    Kif of tubes for above. 2-56s. 1-53, 2-2A3's. I-5Z3.   $6.02 USD.

  • Price in first year of sale
  • 59.00 USD
  • Author
  • Model page created by Glen Orriss. See "Data change" for further contributors.

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