Royal 500 Ch= 7ZT40Z1
Zenith Radio Corp.; Chicago, IL
- Country
- United States of America (USA)
- Manufacturer / Brand
- Zenith Radio Corp.; Chicago, IL
- Year
- 1956/1957
![perfect model](/img/sternRot.gif)
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 267472
-
- alternative name: Chicago Radio Lab
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Transistors
- 7
- Main principle
- Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)
- Tuned circuits
- 5 AM circuit(s)
- Wave bands
- Broadcast only (MW).
- 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.)
- Material
- Plastics (no bakelite or catalin)
- from Radiomuseum.org
- Model: Royal 500 Ch= 7ZT40Z1 - Zenith Radio Corp.; Chicago,
- 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 tuning range is 540-1600kHz. The first 4 models are aluminum chassis, hand wired, point-to-point, and have 4 different chassis numbers due to limited quantities of transistors from manufacturing suppliers. The later 4 models are PCB and included vernier tuning. Chassis have chassis numbers along with a Color Code Dot in the battery compartment with labels in the same Color Code ink.
Year Chassis Number Chassis Type Transistor Source Color Code Dot Cabinet Colors Vernier Tuning 55/56 7XT40 Circuit #1 Hand Wired Sylvania
(NPN)Black R,Y N 55/56 7XT40 Circuit #2 Hand Wired Sylvania
(NPN)Maroon R,Y N 55/56 7XT40Z Hand Wired Raytheon
(PNP)Red R,Y N 55/56 7XT40Z1 Hand Wired Texas Instr. (NPN & PNP) Green R,Y N 56/57 7ZT40 PCB Sylvania
(NPN)Magenta R,W,Y Y 56/57 7ZT40Z1 PCB Texas Instr.
(NPN & PNP)Brown R,W,Y Y 57/58 7ZT40 "Revised" PCB Sylvania
(NPN)Magenta L,R,V,W,Y Y 57/58 7ZT40Z PCB Raytheon
(PNP)Orange L,R,V,W,Y Y Color Codes:
L = Tan/Beige (rare); R = Maroon/Burgundy/Garnet Red (semi-transparent); V = Tango Pink (rare); W = White; Y = Black/Ebony.
- 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
- Mentioned in
- Zenith Transistor Radios (Pages 10-14, 20, 21)
- Literature/Schematics (1)
- - - Manufacturers Literature (Zenith Service Manual "Royal 500" All transistor Portable Radio Chassis 7ZT40 7ZT40Z1)
Radio a transistor tascabili americane: Zenith Royal 500 “Owl Eyes” (Per cortesia di L.Salvatore/ARM) | 3327 KB |
- Documents regarding this model
- Author
- Model page created by Michael Gnaedig-Fischer. See "Data change" for further contributors.
- Other Models
-
Here you find 4492 models, 4097 with images and 3605 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Zenith Radio Corp.; Chicago, IL
Collections
The model Royal 500 is part of the collections of the following members.