• Country
• United States of America (USA)

• Manufacturer / Brand
• Harvey Radio Labs., Harvey - Wells; Brookline, Southbridge, MA

• Year
• 1949 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 360559

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

• Number of Tubes
• 3

• Valves / Tubes
• 6AU6 6AU6 12AU7

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Crystal Microphone Preamplifier CMA-50 - Harvey Radio Labs., Harvey -

• Shape
• Chassis only or for «building in»

• Notes

• External CMA-50 Crystal Microphone Preamplifier for use with Harvey-Wells Bandmaster transmitters that do not have an internal microphone preamplifier.

• Price in first year of sale
• 22.00 USD

• Mentioned in
• - - Manufacturers Literature (Harvey Wells flyer. April 1950)

• Author
• Model page created by David Erali. See "Data change" for further contributors.

• Other Models

• Here you find 40 models, 38 with images and 12 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Harvey Radio Labs., Harvey - Wells; Brookline, Southbridge, MA