Ultra-Fidelity Amplifier 500A

Radio Craftsmen Inc., The; Chicago (IL)

Data
Forum
Pictures
Collections

  • Year
  • 1952–1954
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 133494

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 105-125 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 15 W (unknown quality)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Ultra-Fidelity Amplifier 500A - Radio Craftsmen Inc., The;
  • Shape
  • Chassis only or for «building in»
  • Notes

  • The Radio Craftsmen model 500A (number plate only 500 !) is an AC operated audio amplifier for custom installations with one (mono) input (470 k). For optimum operation, the output tubes KT66 should be a matched pair. The line transformer has 3 positions for line voltage.

    Model 500 is the first model of this line which includes 500, 500A, C550 and C550A. Other names like C500, RC500, C500A, RC500A or RC550A are wrong - but we have to list since so many persons look up under these wrong names. SAMS Photofact is distinguishing between model 500 and model 500A - but Radio Craftsmen made on both a number plate with only "500" as model name. Distinctive is the parts line-up on the plate. Therefore have a closed look to our SAMS reference picture when deciding which model it is.

     

    There is an error on the 500A schematic; AF AMP V1 cathode resistor R4 should be 470 ohms, not 470k ohms.  The PARTS LIST AND DESCRIPTION page correctly lists R4 as 470 ohms.

  • Author
  • Model page created by Ernst Erb. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum