• Country
• United States of America (USA)

• Manufacturer / Brand
• National Company; Cambridge & Malden (MA)

• Year
• 1929 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 102976

• • alternative name: National Toy Co.
  • Brand: Thrillbox

• Number of Tubes
• 4

• Valves / Tubes
• 227 245 245 280

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC)

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Velvetone - National Company; Cambridge &

• Shape
• Chassis only or for «building in»

• Notes
• Power Amplifier for AC mains supply. The tube UX245, later named 245 and 45 was introduced in March 1929. Therefore this model can not be earlier.

• Price in first year of sale
• 177.00 $

• Literature/Schematics (1)
• Chicago Salvage Stock Store catalogue

• Author
• Model page created by Vitor Oliveira. See "Data change" for further contributors.

• Other Models

• Here you find 446 models, 285 with images and 189 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from National Company; Cambridge & Malden (MA)