All-Wave 726SW (early version)

Silver - Marshall; Chicago, IL

Data
Forum
Pictures
Collections

  • Year
  • 1931
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 57942

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

 Technical Specifications

  • Number of Tubes
  • 11
  • Main principle
  • Superhet, double/triple conversion; ZF/IF 175 kHz; Screengrid 1926-1935
  • Tuned circuits
  • 11 AM circuit(s)
  • Wave bands
  • Broadcast plus more than 2 Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC) / 110-120 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 10.5 inch = 26.7 cm
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: All-Wave 726SW - Silver - Marshall; Chicago, IL
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 20.5 x 8.5 x 12 inch / 521 x 216 x 305 mm
  • Notes
  • If this model 726SW hat for the start the tube 35 or 235 then it can only be from May 1931 or later. One dial (primary tuning control knob); push-pull output stage. Probably only for the new version: As a short wave broadcast receiver, the antenna is fed into the short wave detector circuit using a 24 type tube. A short wave oscillator of special design using a '27 tube, operating at 650 kc away from the short wave detector heterodynes the incoming signal to the frequency to which the RF stage of the broadcast receiver is tuned, the broadcast tuning dial being set on a clear channel at approx. 650 kc for best results. As a short wave super, there are therefore three detectors and two oscillators, giving so called double "suping".
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

 Collections | Museums | Literature

 Forum