• Country
• United States of America (USA)

• Manufacturer / Brand
• Walbert Manufacturing Company; Chicago, IL

• Year
• 1925

• Category
• RF (Radio Frequency-) Amplifier

• Radiomuseum.org ID
• 64699

• • Brand: Isofarad

• Number of Tubes
• 1

• Valves / Tubes

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - - No sound reproduction output.

• from Radiomuseum.org
• Model: Penetrola [old T] - Walbert Manufacturing Company;

• Shape
• Tablemodel, slant panel.

• Notes
• One dial (primary tuning control knob)

• Price in first year of sale
• 35.00 $

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

• Literature/Schematics (2)
• Radio Broadcast, Jan. 1926, p. 417

• Other Models

• Here you find 21 models, 6 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Walbert Manufacturing Company; Chicago, IL