Opera 621A

• Country
• Czechoslovakia

• Manufacturer / Brand
• Tesla; Praha, Bratislava etc.

• Year
• 1955/1956

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 70839

• • Brand: Supraphon

• Picture
• Schematics

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

• Number of Tubes
• 9

• Valves / Tubes
• ECH21 6F31 6BC32 6CC31 EM11 6L31 6L31 6Z31 6Z31

• Main principle
• Superheterodyne (common); ZF/IF 452 kHz

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and Short Wave.

• Power type and voltage
• Alternating Current supply (AC) / 110-240 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 27 cm = 10.6 inch

• Power out
• 5 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Opera 621A - Tesla; Praha, Bratislava etc.

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 660 x 520 x 215 mm / 26 x 20.5 x 8.5 inch

• Notes
• Wellenbereiche: LW 1000...2000 m; MW 185...672 m; KW 16,5...51,5 m. Im KW-Bereich rastet die Abstimmung bei den Rundfunbereichen (16m, 19m,...31m, 41, 49m) ein, die dann mit einer KW-Lupe (zweiter Abstimmnopf) abgestimmt werden können. Durch Drücken des Hauptknopfes kann die Rastung wieder aufgehoben werden.

• Net weight (2.2 lb = 1 kg)
• 20 kg / 44 lb 0.8 oz (44.053 lb)

• Mentioned in
• Ceskoslovenske Rozhlasove a Televizni Prijimace I a II

• Author
• Model page created by Gabriel Toth. See "Data change" for further contributors.

• Other Models

• Here you find 1842 models, 1163 with images and 668 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Tesla; Praha, Bratislava etc.