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Royal 275-J Ch= 7CT40Z2 late

Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1816656) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1816657) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1816658) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1816659) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1816660) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1816661) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 584086) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 584087) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 584088) Radio
 
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 584089) Radio
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Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 577891) Radio Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 577888) Radio
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 577889) Radio Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 577885) Radio
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1601969) Radio Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1601970) Radio
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1601972) Radio Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1601973) Radio
Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1601974) Radio Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 1601975) Radio
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Royal 275-J Ch= 7CT40Z2; Zenith Radio Corp.; (ID = 577891) Radio
Zenith Radio Corp.;: Royal 275-J Ch= 7CT40Z2 [Radio] ID = 577891 448x575
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For model Royal 275-J Ch= 7CT40Z2 late, Zenith Radio Corp.; Chicago, IL:
Zenith_275J_with courtesy from Roy Ulko. Side view
 
Country:  United States of America (USA)
Manufacturer / Brand:  Zenith Radio Corp.; Chicago, IL
alternative name
 
Chicago Radio Lab
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)
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.

Please check the color code before uploading pictures.
The letter suffix is not shown on the model but there are the following codes for colors: 275B (dark blue with a light blue back), 275F (dark green with a light green), 275J (brown and a tan back) and 257Y (black with a beige back). As model name we list with a hyphen as 275-B, 275-F, 275-J and 275-Y so that you get the chance to find by 275 alone or with color suffix.

Both, the early and the late version are featured in Photofact set 486, folder 28 on May 1960.
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.

Collection of Aldo Andreani (I)
  
rmXorg