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ID = 12715
Brand: Common type Europe tube/semicond.
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Secondary Emission Tetrode   RF/IF-Stage 
Identical to EE50
First year 1939 Tube leaflet collection E.Erb Philips-Book [178]
First Source (s)
25.Aug.1938 : Wireless World (The), London (WW, 79) p181
Predecessor Tubes EE1  

Base Loctal-9-Pin (B9G) (Codex=Y)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AC/DC

Secondary Emission. 20mA/V.

Developed by Philips/Mullard for broad-band TV use in 1938 using an intermediate cathode for secondary emission to achieve high gain from a single tube. The B9G base and the all-glass construction with aluminium shield was developed for this tube to achieve short electrical paths and low capacitance.

It was quickly superseded by the EF50 - a standard pentode - of similar mechanical construction which has a lower noise figure.

Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

EE50: ficha de valvulas
Getulio Jimenez-Gomez
    More ...
lo33.png EE50: RTT 1974 (Franzis) 13. Auflage
Martin Renz

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Just Qvigstad
EE50: rtt
Anonymous 10 Collector

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Usage in Models 2= 1939 ; 1= 1940?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of




All glass valve without aluminium can with hooked pins. Source Miniwatt-Dario advert in the magazine Le Haut-Parleur N ° 694 of December 4, 1938 special television.

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