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Royal 500 Ch=7XT40Z1 2nd Production

Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831386) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831387) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831388) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831389) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831390) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831391) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831392) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831393) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831394) Radio
 
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1831395) Radio
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1989483) Radio Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1989485) Radio
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1989486) Radio Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 2452570) Radio
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 2452571) Radio Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 2452573) Radio
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 2452575) Radio Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 2452577) Radio
Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 2452578) Radio
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Royal 500 Ch=7XT40Z1; Zenith Radio Corp.; (ID = 1989483) Radio
Zenith Radio Corp.;: Royal 500 Ch=7XT40Z1 [Radio] ID = 1989483 1039x1563
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For model Royal 500 Ch=7XT40Z1 2nd Production, Zenith Radio Corp.; Chicago, IL:
Copy from Ebay seller jonar40.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Zenith Radio Corp.; Chicago, IL
alternative name
 
Chicago Radio Lab
Year: 1956/1957 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 7: R41_TI R12_TI R14_TI R14_TI 1N295 R15_TI R16_TI R16_TI
Main principle Super-Heterodyne (Super in general); 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 / "AA" 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 500 Ch=7XT40Z1 [2nd Production] - Zenith Radio Corp.; Chicago,
Material Modern plastics (no Bakelite or Catalin)
Shape Very small Portable or Pocket-Set (Handheld) < 8 inch.
Dimensions (WHD) 3.5 x 5.75 x 1.5 inch / 89 x 146 x 38 mm
Notes

The Zenith Royal 500 is a battery operated 7 transistor portable BC band radio. The BC band frequency tuning range is 540-1600kHz. The 2nd production run had 2 different chassis due to limited quantities of transistors from various manufacturers.  Chassis have chassis numbers along with a color code dot in battery compartment.

Year Production
Run
Chassis
Number
Chassis
Type
Transistor
Source
Color Code
Dot
Cabinet
Colors
55/56 1 7XT40 Circuit 1 Hand Wired Sylvania Black R,Y
55/56 1 7XT40 Circuit 2 Hand Wired Sylvania Maroon R,Y
55/56 1 7XT40Z Hand Wired Raytheon Red R,Y
55/56 1 7XT40Z1 Hand Wired Texas Instr. Green R,Y
56/57 2 7XT40 Hand Wired Sylvania Magenta R,W,Y
56/57 2 7XT40Z1 Hand Wired Texas Instr. Brown R,W,Y
57/58 3 7ZT40 "Revised" PCB Sylvania Magenta L,R,V,W,Y
57/58 3 7ZT40Z PCB Raytheon Orange L,R,V,W,Y

The 2 7XT40 chassis from the 1st production run are similar except use different transistors. See notes below for colors.

Net weight (2.2 lb = 1 kg) 1 lb 3 oz (1.187 lb) / 0.539 kg
Price in first year of sale 75.00 USD
External source of data Ernst Erb
Mentioned in Zenith Transistor Radios (Pages 10-14, 20, 21)
Literature/Schematics (1) Transistor Radios 1954-68 (Antique Radio Magazine n.61, June-July 2004, page 53 (Ita/Eng). Free at Aldo Andreani's website.)
Literature/Schematics (2) - - Manufacturers Literature (Zenith Supplementary Service Manual "Royal 500" All Transistor Portable Radio Chassis 7ZT40 7ZT40Z1)
Literature/Schematics (3) - - Manufacturers Literature (Zenith Service Manual "Royal 500" All transistor Portable Radio)
Literature/Schematics (4) Photofact Folder, Howard W. SAMS (Set 333 Folder 1 dated 10-56)
Documents about this model
  Radio a transistor tascabili americane: Zenith Royal 500 “Owl Eyes” (Per cortesia di L.Salvatore/ARM) 3327 KB

Model page created by John Kusching. See "Data change" for further contributors.



All listed radios etc. from Zenith Radio Corp.; Chicago, IL
Here you find 4155 models, 3607 with images and 3261 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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