Special DC Power Amplifier PA-503

Try-Mo (Powertone) Radio Co., Inc.; NY

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  • Year
  • 1933
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 368639

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Direct Current supply (DC) / 110; 220 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 3.5 W (undistorted)
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Special DC Power Amplifier PA-503 - Try-Mo Powertone Radio Co.,
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • Why lose profitable public address amplifier jobs because there is no A.C. circuit available and you do not have a converter? One of these high output D.C. models will permit you to handle any D.C. job. May be supplied for either 110 or 220 volts D.C. operation. A new high efficiency circuit is employed using two stages of transformer coupled voltage amplification feeding a 2— T.S. 57 Power pentodes in the output stage. There is ample power available for all ordinary requirements (3.5 watts) with true realistic tone. Ample gain is provided for all uses. May be used with microphone or phono pickup. Input is direct to the grid of the first stage while the output is high impedance—will feed either magnetic or dynamic speakers. A built-in graduated volume control is provided for perfect control of output from full auditorium volume to a mere whisper.  Tubes required: 2— 112, 2—T.S. 57 

    Assembled and tested, less tubes.

    Kit of RCA Licensed Tubes $2.75 USD.

     

  • Price in first year of sale
  • 12.95 USD
  • Mentioned in
  • -- Original prospect or advert (1933 Try-Mo Radio Co Catalog page 14)
  • Author
  • Model page created by Glen Orriss. See "Data change" for further contributors.

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