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ID = 12838
Brand: Sator (brand of Tungsram for tubes)
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to NDG4 = REN704d

Base Europe 5-Pin , B5 + side contact (Codex=Fa)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)

This tube is a tetrode to be used as self oscillating frequency converter. The oscillator feedback is applied to grid 1, the input signal to grid 2. Its amplification is low and not to control, the oscillator voltage is closely coupled to the input circuit.

Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
NDG4: Telefunken Werkstattbuch
Wolfgang Bauer

NDG4: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

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