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Chicago Radio Lab | ||||
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Year: 1959/1960 | Category: Broadcast Receiver - or past WW2 Tuner | ||||
Semiconductors (the count is only for transistors) | 7: 2N411 2N409 2N409 2N409 2N407 2N407 2N407 1N87G |
Main principle | Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s) |
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Tuned circuits | 5 AM circuit(s) |
Wave bands | Broadcast only (MW). |
Details | |
Power type and voltage | Dry Batteries / 4 x 1,5 Volt |
Loudspeaker | Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 2.75 inch = 7 cm |
Power out | 0.1 W (0.18 W max.) |
from Radiomuseum.org | Model: Royal 275-J Ch= 7CT40Z2 [late] - Zenith Radio Corp.; Chicago, |
Material | Plastics (no bakelite or catalin) |
Shape | Very small Portable or Pocket-Set (Handheld) < 8 inch. |
Dimensions (WHD) | 5.75 x 3.75 x 1.75 inch / 146 x 95 x 44 mm |
Notes | The Zenith Royal 275-J is a battery operated 7 transistor portable BC band receiver. The BC band frequency tuning range is 540-1600kHz. Has push-pull output stage and earphone jack that disconnects the speaker for private listening.
The Zenith Royal model 275 is available in an early version with the inscription "The Statesman" on the upper front (chassis = 7CT40Z1) and a later version without this (chassis = 7CT40Z2). It looks similar to the Royal 250 but has two-tone cabinets and a gear reduced vernier tuning. As a cheaper radio, it has a plastic case rather the nylon cabinet like the 500 with practically the same chassis. |
Price in first year of sale | 50.00 $ |
Literature/Schematics (1) | Photofact Folder, Howard W. SAMS (Date 5-60, Set 486, Folder 28) |
Literature/Schematics (2) | - - Manufacturers Literature (Zenith Service Manual Model "Royal 275" Transistor Portable Radio dated 5-26-59) |
Literature/Schematics (3) | Beitman Radio Diagrams, Vol. 20, 1960 (Pages 179, 180) |
Model page created by Ernst Erb. See "Data change" for further contributors.
All listed radios etc. from Zenith Radio Corp.; Chicago, IL
Here you find 4275 models, 3894 with images and 3389 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.