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ID = 1987
Brand: Common type Europe tube/semicond.
Developer: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH 
Tube type:  Vacuum Pentode   Power/Output 
Identical to UL12
First year Dec.1940 Tube leaflet collection E.Erb Analysis by original leaflets
Predecessor Tubes CL6  
Successor Tubes 1955   UL84  

Base German Steel Y8A, 1938 (Codex=Rdo)
Filament Vf 60 Volts / If 0.1 Ampere / Indirect / Series, AC/DC
Information source Taschenbuch zum Röhren-Codex 1948/49   
  UL12: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
UL12: Sammlung
Karlheinz Fischer

UL12: Lorenz Empfänger-Röhren , 9. Auflage
Anonymous 54 Collector

UL12: SEL Handbuch 1964
Peter Hoddow

from Just Qvigstad

Usage in Models 1= 1940?? ; 4= 1940? ; 4= 1940 ; 1= 1941?? ; 1= 1941? ; 2= 1941 ; 3= 1942 ; 1= 1946? ; 2= 1950

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):19

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