• Country
• United States of America (USA)

• Manufacturer / Brand
• Philco, Philadelphia Stg. Batt. Co.; USA

• Year
• 1931

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 50481

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

• Number of Tubes
• 7

• Valves / Tubes
• 24 24 24 27 71A 71A 80

• Main principle
• TRF without regeneration; Screengrid 1926-1935

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 21 Baby Grand [Table] - Philco, Philadelphia Stg. Batt

• Shape
• Table-Cathedral-Type (upright, round top or gothic arch, not rounded edges only).

• Dimensions (WHD)
• 16.5 x 18 x 10 inch / 419 x 457 x 254 mm

• Notes

• Although the model 21 Baby Grand table radio was not Philco's first cathedral radio design, it was the first to use the particular cabinet which became known as the "classic" cathedral radio, with ribbed pillars supporting the arch, fancy cutout speaker grill, and opposing slant-pattern veneer on the overlay of the arch. Model 21 Baby Grand was also available in a console cabinet.

  Stein Vol. II calls this model "21B".

  Stein "Cathedral & Tombstone Radios" lists 6 tubes.

   

• Price in first year of sale
• 50.00 $

• External source of data
• Ernst Erb

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Mentioned in
• Guide to Old Radios

• Literature/Schematics (1)
• Philco Radio 1928-1942 (Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data)

• Literature/Schematics (2)
• Machine Age to Jet Age II (page 209.)

• Literature/Schematics (3)
• Cathedral & Tombstone Radios (page 191.)

• Other Models

• Here you find 4038 models, 2216 with images and 3687 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA