• Country
• Poland

• Manufacturer / Brand
• PTR - Polskie Towarzystwo Radjotechniczne; Warszawa

• Year
• 1924–1928 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 143695

• Number of Tubes
• 4

• Valves / Tubes
• SRM SRM SRM PRM

• Main principle
• TRF with regeneration; 3 AF stage(s)

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast (MW) and Long Wave.

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: 4 LB - PTR - Polskie Towarzystwo

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

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

• Literature/Schematics (1)
• Zlote Lata Radia, Polen

• Author
• Model page created by Henryk Berezowski. See "Data change" for further contributors.

• Other Models

• Here you find 13 models, 9 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from PTR - Polskie Towarzystwo Radjotechniczne; Warszawa