• Country
• United States of America (USA)

• Manufacturer / Brand
• Electro-Voice Inc.; USA

• Year
• 1954 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 123261

• • Brand: Buchanan

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

• Number of Tubes
• 6

• Valves / Tubes
• 12AX7 12BH7 6BG6G 6BG6G 5Y3GT 5Y3GT

• Number of Transistors

• Semiconductors
• Selenium-Rectifier Selenium-Rectifier

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 60 Hz, 117V = 110 -120 Volt

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

• Power out
• 30 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: A30 Circlotron Line Amplifier - Electro-Voice Inc.; USA

• Shape
• Tablemodel, with any shape - general.

• Notes

• 30W audio amplifier using the patented Circlotron (PPP) output stage. Frequency response 20 to 70.000Hz within 0.25dB.
  Built-in power supply for preamplifier PRC1 or PRC2.

  Electro-Voice model A30 is an AC operated 30 Watt audio amplifier.

• Mentioned in
• The Radio-Electronic Master, 1956

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date 1-56, Set 304, Folder 6)

• Literature/Schematics (2)
• D.J. Tomcik and A.M. Wiggins, New amplifier has bridge-circuit output, in Audio, Novmber 1954, p. 17

• Literature/Schematics (3)
• Photofact Folder, Howard W. SAMS (Set 293 Folder 4 dated 10-55)

• Author
• Model page created by Emilio Ciardiello. See "Data change" for further contributors.

• Other Models

• Here you find 124 models, 115 with images and 45 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Electro-Voice Inc.; USA