• Country
• United States of America (USA)

• Manufacturer / Brand
• Western Electric Company Inc.; New York (NY)

• Year
• 1950 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 244962

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

• Number of Tubes
• 10

• Valves / Tubes
• 6SN7 6SN7 6SN7 350B 350B 350B 350B 6SN7 5R4GY 5R4GY 0C3 or VR105

• Main principle
• Audio-Amplification

• Wave bands
• - without

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

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

• Power out
• 75 W (max.)

• Material
• Metal case

• from Radiomuseum.org
• Model: 143-A - Western Electric Company Inc.;

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 12.25 x 8.5 x 19 inch / 311 x 216 x 483 mm

• Notes

• The Western Electric 143A Amplifier is a high quality, medium gain power amplifier intended as a basic amplifier for public adress sound distribution systems and wired program service. It has two high impedance input connections controlled by a master volume control; and the chassis has provisions for addition of pre-amplifiers and apparatus units for various input combinations.

  Typical characteristics:

  • Frequency response: +/- 1 dB 50 to 15,000 cycles
  • Output noise: -30 dBm
  • Harmonic distortion: See Output Power
  • Source impedance: 0 to 250,000 ohms
  • Load impedance: 1.5 to 170 ohms
  • Loadspeaker line: 70 volts
  • Gain: 52 dB from 600 ohm source
  • Gain control: continuously variable
  • Output power: 75 watts as supplied with Western Electric 350B tubes in the output stage, with less than 5% distortion over the range of 50 to 7,500 cycles. 50 watts, 5% distortion, 50 to 7,500 cycles when reconnected for 6L6 Tubes in the output stage.
  • Power supply: 105 to 125 volts, 60 cycles. 335 watts maximum (3 amperes). Fused with thermal cut out fuse.
  • Mounting: Either surface or rack mounting
  • Finish: Light gray

• Net weight (2.2 lb = 1 kg)
• 46 lb (46 lb 0 oz) / 20.884 kg

• Mentioned in
• -- Original-techn. papers.

• Author
• Model page created by Tall Wilson. See "Data change" for further contributors.

• Other Models

• Here you find 164 models, 141 with images and 33 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Western Electric Company Inc.; New York (NY)