• Country
• Germany

• Manufacturer / Brand
• Gierner & Sohn (Giso); Hamburg

• Year
• 1925

• Category
• RF (Radio Frequency-) Amplifier

• Radiomuseum.org ID
• 14807

• • Brand: GISO

• Number of Tubes
• 1

• Valves / Tubes

• Main principle
• Radio Frequency Amplification only

• Tuned circuits
• 1 AM circuit(s)

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

• Loudspeaker
• - For headphones or amp.

• from Radiomuseum.org
• Model: HV1 - Gierner & Sohn Giso; Hamburg

• Notes
• HF-Vorstufe zu A1F

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Historische Radios Band III (98)

• Other Models

• Here you find 12 models, 1 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Gierner & Sohn (Giso); Hamburg