• Country
• United States of America (USA)

• Manufacturer / Brand
• Ritchie, E.S. & Sons, Brookline, Massachusetts

• Year
• 1923 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 114640

• Number of Tubes
• 3

• Valves / Tubes
• UV201A UV201A UV201A

• Main principle
• Audio-Amplification; ZF/IF n/a kHz; 2 AF stage(s)

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries / 90/6 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: CA-1 - Ritchie, E.S. & Sons,

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 9.5 x 8.5 x 11 inch / 241 x 216 x 279 mm

• Notes
• Supplimental audio amplifier for early battery type radios. Output stage has two UX201's in parallel. Input and interstage transformers made by Sampson Electric. Model has two internal 4.5v bias batteries. B-plus power for input stage is "borrowed" from the radio connected to this model's input terminals.

• Net weight (2.2 lb = 1 kg)
• 0.3 kg / 0 lb 10.6 oz (0.661 lb)

• Source of data
• - - Data from my own collection

• Author
• Model page created by Robert Deuel. See "Data change" for further contributors.

• Other Models

• Here you find 4 models, 4 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ritchie, E.S. & Sons, Brookline, Massachusetts