• Country
• United States of America (USA)

• Manufacturer / Brand
• Speak-O-Phone, Recording and Equipment Company; New York City, NY

• Year
• 1939 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 351223

• Number of Tubes
• 4

• Valves / Tubes
• 6J7 6C8 6V6 5Z4

• Wave bands
• - without

• Details
• Loudspeaker + integr.Amplifier

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Power out
• 4.2 W (undistorted)

• Material
• Metal case

• from Radiomuseum.org
• Model: Recording Amplifier 11-M - Speak-O-Phone, Recording and

• Shape
• Chassis only or for «building in»

• Notes

• May be used as a recording or public address (PA) amplifier.

• Price in first year of sale
• 39.50 USD

• Mentioned in
• -- Original prospect or advert (Speak-O-Phone General Catalog No. 7-8)

• Author
• Model page created by Ed Riley. See "Data change" for further contributors.

• Other Models

• Here you find 7 models, 4 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Speak-O-Phone, Recording and Equipment Company; New York City, NY