• Country
• United States of America (USA)

• Manufacturer / Brand
• Detrola; Detroit (MI)

• Year
• 1935 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 37397

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

• Number of Tubes
• 7

• Valves / Tubes
• 78 78 37 78 75 42 80

• Main principle
• Superhet with RF-stage; ZF/IF 262 kHz; 2 AF stage(s)

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast plus more than 2 Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC) / 117 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm

• Power out
• 3 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 7A [Airplane dial] - Detrola; Detroit MI

• Shape
• Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.

• Dimensions (WHD)
• 14 x 18 x 9 inch / 356 x 457 x 229 mm

• Notes

• Separate oscillator tube (37). BC (550-1520 kHz), TROP (1.5-4.0 MHz), SW1 (3.6-10.0 MHz) and SW2 (8.0-10.0 MHz) bands.

  Stein "Cathedral & Tombstone Radios" calls this model "7A3" and lists two bands.

  See also the predecessor Detrola 7A with full vision dial and different cabinet style.

• External source of data
• Ernst Erb

• Source of data
• Collector's Guide to Antique Radios (6th edition)

• Circuit diagram reference
• Rider's Perpetual, Volume 6 = 1935 and before

• Mentioned in
• Machine Age to Jet Age III

• Literature/Schematics (1)
• Cathedral & Tombstone Radios (page 94.)

• Literature/Schematics (2)
• Rider's Perpetual, Volume 6 = 1935 and before (Riders Vol. VI, page 6-15 and 6-16 Detrola Radio Corp.)

• Other Models

• Here you find 330 models, 192 with images and 287 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Detrola; Detroit (MI)