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ID = 33276
Tube type:  Vacuum Pentode   Controlling (mu) 
  Late but very rare. ***
Identical to 3172a
Similar Tubes
Other base and data slightly different:

Base EU-Telephone 7-pin (G7K) Top contact with a cap.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel / series AC/DC
Description Hersteller vermutlich Siemens Wien, Ua=250V, Ia=12...0,5mA, Ug2=120V, Ig2=5...0,2mA, Ug1=-2...-20V, S=2,3...0,1mA/V, Ri=600kÙ, Pamax=3W, Pg2max=0,8W 
Information source
3172a: Lorenz Empfänger-Röhren ,9. Auflage
Anonymous 54 Collector


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