• Country
• Yugoslavia

• Manufacturer / Brand
• Erma, Elektro-Radio-Mehanika, Elektro Radio Tovarna (ETR); Šmarje

• Year
• 1957 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 220612

• Number of Tubes
• 10

• Valves / Tubes
• ECH21 6F31 6BA6 6CC31 EM11 616 6L31 6AQ5 6Z31 6X4

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast plus 2 Short Wave bands.

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

• Loudspeaker
• 2 Loudspeakers

• Material
• Wooden case

• from Radiomuseum.org
• Model: Koper 57 RS4 [5 buttons] - Erma, Elektro-Radio-Mehanika,

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 635 x 425 x 260 mm / 25 x 16.7 x 10.2 inch

• Net weight (2.2 lb = 1 kg)
• 15.7 kg / 34 lb 9.3 oz (34.581 lb)

• Author
• Model page created by Zlatan Mumlek. See "Data change" for further contributors.

• Other Models

• Here you find 7 models, 7 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Erma, Elektro-Radio-Mehanika, Elektro Radio Tovarna (ETR); Šmarje