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TR-33; Sony Corporation; (ID = 313003) Radio
TR-33; Sony Corporation; (ID = 421415) Radio TR-33; Sony Corporation; (ID = 421416) Radio
TR-33; Sony Corporation; (ID = 421417) Radio
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TR-33; Sony Corporation; (ID = 421415) Radio
Sony Corporation;: TR-33 [Radio] ID = 421415 480x373
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For model TR-33, Sony Corporation; Tokyo
Country:  Japan
Manufacturer / Brand:  Sony Corporation; Tokyo
Year: 1955 Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 3: 2T51 2T52 2T53
Main principle Superheterodyne (common); ZF/IF 245 kHz; 2 AF stage(s); Reflex
Tuned circuits 4 AM circuit(s)
Wave bands Broadcast only (MW).
Power type and voltage Dry Batteries / 2 x 1,5 Volt
Loudspeaker - only for Earphone!
Power out
from Model: TR-33 - Sony Corporation; Tokyo
Material Modern plastics (no Bakelite or Catalin)
Shape Very small Portable or Pocket-Set (Handheld) < 8 inch.
Dimensions (WHD) 74 x 110 x 27 mm / 2.9 x 4.3 x 1.1 inch
Notes The TR-33 went on sale as Japan's first commercially built earphone-only transistor radio in October 1955, just two months after the Sony TR-55. Eager to fully leverage the small size of transistors and produce a true pocket radio, Sony forewent an audio amp and speaker in building the TR-33. The TR-33 utilized three Sony high-frequency transistors in its reflex superheterodyne circuit design. Technical firsts include the use of the new Mitsumi "POLYVARICON" (Polyethylene Variable Capacitor), and also of N-cell (UM-5) batteries as a power source. Despite its innovative design, the TR-33 failed to sell well due to high pricing and the difficulty of obtaining N-cell batteries. Stated production figures vary from 1000 to 3000 units in total.
Net weight (2.2 lb = 1 kg) 0.2 kg / 0 lb 7 oz (0.441 lb)
Price in first year of sale 12'600.00 yen

Model page created by Ernst Erb. See "Data change" for further contributors.

All listed radios etc. from Sony Corporation; Tokyo
Here you find 3524 models, 3264 with images and 747 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.