• Country
• United States of America (USA)

• Manufacturer / Brand
• Turner Co. (The); Cedar Rapids (IA)

• Year
• 1976

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 339801

• • Brand: Colortone

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

• Number of Transistors
• 4

• Semiconductors
• 2N3707 2N3710 2N3710 unknown_tr_PNP 1N34

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / 9 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: CB Base Microphone with Preamplifier Expander 500 Simplified Circuit - Turner Co. The; Cedar Rapids

• Dimensions (WHD)
• 5.375 x 9.5 x 8.75 inch / 137 x 241 x 222 mm

• Notes

• Cardioid / Dynamic pre-amplified microphone for transmission systems.
  Equipped with tone and volume adjustment and S-Meter for controlling the output level.
  Lock Key for continuous transmission.

• Net weight (2.2 lb = 1 kg)
• 1.75 lb (1 lb 12 oz) / 0.795 kg

• Price in first year of sale
• 65.00 USD

• Mentioned in
• -- Original prospect or advert (“CQ Elettronica”, Italy, CD editor, number 5/125, May 1977.)

• Literature/Schematics (1)
• Base Station Communications, Specifications for EX 500, Turner Microphones

• Literature/Schematics (2)
• Popular Electronics, Oct. 1976, page 10, "New Expander 500"

• Author
• Model page created by Pier Antonio Aluffi. See "Data change" for further contributors.

• Other Models

• Here you find 74 models, 57 with images and 23 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Turner Co. (The); Cedar Rapids (IA)