• Country
• United States of America (USA)

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

• Year
• 1940/1941

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 155037

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

• Number of Tubes
• 5

• Valves / Tubes
• 7A8 7B7 7C6 35A5 35Z3

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / 115 Volt

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

• Material
• Bakelite case

• from Radiomuseum.org
• Model: PT-25 Transitone [1940] - Philco, Philadelphia Stg. Batt

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Notes

• The early version of Philco Transitone model PT-25 from 1939 is marked as code 121 and has horizontal ribs across the speaker grill of its dark brown bakelite cabinet.

  This is the second version from 1940 with code 122. It has a tuing range of 540 - 1720 kc and has horizontal sloped louvers across the speaker grill - as has the third version of 1941 with a slightly different scale.

  Models PT-26 are the same but have a Built-In Loop Aerial. Of our knowledge all models PT-25 and PT-26 have dark knobs.

  The versions of PT-27 differ with ivory painted bakelite cabinets and knobs. Models PT-28 are the same but have a Built-In Loop Aerial.

• Price in first year of sale
• 9.95 $

• Source of data
• Philco Radio 1928-1942

• Circuit diagram reference
• Rider's Perpetual, Volume 12 = ca. 1941 and before

• Mentioned in
• Machine Age to Jet Age II (page 223.)

• Literature/Schematics (1)
• Philco 1940 RMS Yearbook

• Literature/Schematics (3)
• Philco Folder No. PR-799-A for 1941.

• Author
• Model page created by Thomas Albrecht. See "Data change" for further contributors.

• Other Models

• Here you find 4041 models, 2218 with images and 3690 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA