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ID = 328
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Developer: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to EF15
Similar Tubes
Heater different:
Other base:
First year 1950 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
May.1950 : Funkschau #10, 1950
Successor Tubes 1950   EF175   EF43   EF85  

Base German Steel Y8A, 1938
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC

Ua: 250V; Ug2: 100V; Ug1: -2V; Rk: 130 Ohm; Ia: 12 mA; Ig2: 3 mA; S: 6 mA/V; Ri: 500 kOhm

Tube prices 4 Tube prices (visible for members only)
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   

EF15: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

st35.png EF15: RTT 1974 (Franzis) 13. Auflage
Martin Renz

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Just Qvigstad
EF15: Hönger, Röhrentaschenbuch, 1952
Anonymous 15 Collector

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Usage in Models 2= 1950? ; 23= 1950 ; 17= 1951 ; 2= 1952

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):44

Collection of



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