37-84B (37-84, 37-84A) Code 122 Early

• Country
• United States of America (USA)

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

• Year
• 1936/1937

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 50555

• Picture
• Schematics

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

• Number of Tubes
• 4

• Valves / Tubes
• 6J7G 6J7G 6F6G 5Y4G

• Main principle
• Superheterodyne (common); ZF/IF 470 kHz; Super, reaction, but not adjustable

• 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)

• Power out
• 0.5 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 37-84B Code 122 [Early] - Philco, Philadelphia Stg. Batt

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

• Notes

• Philco model 37-84B was the fourth and final generation (following models 80B, 81B, and 84B) of low cost 4-tube cathedrals that used a regenerative combined IF/detector stage in a superheterodyne circuit to maximize sensitivity with very few components.
  
  Three versions of 37-84B are known: Code 121 uses a chassis with the old style tube lineup of the previous model 84B. The two versions of 37-84B code 122 use more modern octal tubes. While the standard versions of these chassis are for 50-60 Hz AC power, there was also a 37-84A chassis for 25-40 Hz power (probably available for both codes 121 and 122). Note that the -A suffix is a chassis suffix, not to be confused with the main model number -B suffix, which indicates cathedral cabinet.
  
  The early version of code 122 has four vertical bars through the speaker opening. The late version has simple curvy lattice work in the lower part of the speaker opening. Code 121 has a cabinet similar to the late version of code 122, even though its tube lineup suggests it was chronologically first.

• Price in first year of sale
• 20.00 $

• External source of data
• Ernst Erb

• Source of data
• Collector's Guide to Antique Radios 4. Edition

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Literature/Schematics (1)
• Philco Radio 1928-1942 (Philco Service Bulletin # 244)

• Literature/Schematics (2)
• Machine Age to Jet Age II (page 212.)

• Literature/Schematics (3)
• Philco Folder No. PR-430 for 1937.

• Literature/Schematics (4)
• Cathedral & Tombstone Radios (page 194.)

• Other Models

• Here you find 4033 models, 2216 with images and 3682 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA