750 All Electric 7 SM-720

Silver - Marshall; Chicago, IL

Data
Forum
Pictures
Collections

  • Year
  • 1929
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 368033

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • TRF (Tuned-Radio-Frequency but use of regeneration unknown)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / 105-120 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 750 All Electric 7 SM-720 - Silver - Marshall; Chicago, IL
  • Shape
  • Tablemodel, low profile (big size).
  • Dimensions (WHD)
  • 23 x 8 x 12 inch / 584 x 203 x 305 mm
  • Notes

  • THE CIRCUIT
    One untuned R.F. ballast stage Is followed by two efficient high gain tuned R.F. stages and tuned detector employing the 227 heater type tube. A stage of finest quality audio amplification works into a stage of push pull using two 171A tubes. All stages function at peak efficiency.

    Sensitive—Selective
    The new SM 750 is a powerful receiver. It will bring you distant reception under normal
    operating conditions .with perfection of tone. You could expect no more from a radio receiver than the SM 750 will give you. All electric— actual light socket operation. Sensitive— many distant stations are received with the full volume of locals. Selective. 10 kilocycle separation is accomplished without sacrifice to tone quality. Powerful with fidelity of reproduction found only in the highest priced receivers. 

    SM 750 All Electric 7 with all accessories except loudspeaker complete ready to plug in and operate. Includes four 226 tubes, one 227, two 171A tubes and one 280 rectifying tube and aerial equipment.

    Not to be confused with the 6-tube S-M Screen Grid Six SM-720 Kit.

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

 Collections | Museums | Literature

 Forum