• Country
• United States of America (USA)

• Manufacturer / Brand
• Zenith Radio Corp.; Chicago, IL

• Year
• 1964/1965

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 87424

• • alternative name: Chicago Radio Lab

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 7

• Semiconductors
• 2SA234 2SA234 2SA33 2SA33 2SB77 2SB77 2SB77

• Main principle
• Superhet with RF-stage; ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / Batteries: "AA" 4 x 1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3.5 inch = 8.9 cm

• Power out
• 0.2 W (0.295 W max.)

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: Royal 705JM Ch= 7MT45Z9 - Zenith Radio Corp.; Chicago,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 7.25 x 5.5 x 3 inch / 184 x 140 x 76 mm

• Notes

• The Zenith Royal 705JM is a portable, battery operated 7 transistor BC band receiver. The BC band frequency tuning range is 540 to 1600kHz.  Uses Qty(4) "AA" batteries. Has RF stage and push-pull audio output stage.  Also has earphone jack that disconnects the speaker for private listening. Has leather covered cabinet.

  The Royal 705 family of radio's consisted of the following models that use the same schematics and cabinets:

  Model	Chassis	Cabinet Color
  Royal 705JM	7MT45Z8	Brown
  Royal 705YM	7MT45Z8	Ebony
  Royal 705JM	7MT45Z9	Brown
  Royal 705YM	7MT45Z9	Ebony

  The transistors are the only difference in the chassis.

  NOTE: Beitman lists model Royal 705M, however this is an incomplete model number.  The complete model numbers are listed in the table above.

• Literature/Schematics (1)
• - - Manufacturers Literature (Zenith Service Manual Model Royal 705M dated 5/7/65)

• Literature/Schematics (2)
• Photofact TSM Transistor Radio Series SAMS (TSM-66 dated February 1966 pages 147 to 150)

• Literature/Schematics (3)
• Beitman Radio Diagrams, Vol. 26, 1966 (Page 167)

• Author
• Model page created by Egon Penker. See "Data change" for further contributors.

• Other Models

• Here you find 4491 models, 4096 with images and 3595 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenith Radio Corp.; Chicago, IL