• Country
• Germany

• Manufacturer / Brand
• Graetz, Altena (Westfalen)

• Year
• 1972 ?

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 145828

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 2

• Semiconductors
• BC148 BC148

• Main principle
• Audio-Amplification

• Power type and voltage
• Powered by external power supply or a main unit. / 9-12,5 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Various materials

• from Radiomuseum.org
• Model: Entzerrer -Vorverstärker EV 4 5813 01 03 - Graetz, Altena Westfalen

• Shape
• Chassis only or for «building in»

• Notes
• Für Stereo ausgelegt.
  Verstärkungsfaktor bei 1kHz: 20.
  Klirfaktor bei 70mV Ausgangsspannung: < 0,1%.
  Empfindlichkeit für 70mV: 3,5mV

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Willi Ribbe. See "Data change" for further contributors.

• Other Models

• Here you find 778 models, 698 with images and 596 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Graetz, Altena (Westfalen)