Antique radios, Old Time Radios

EE50

Country:	Europe	Brand:	Common type Europe tube
		Developer:	Philips; Eindhoven (tubes international!); Netherlands
		Tube type:	Secondary Emission Tetrode RF/IF-Stage

Tube ID = 12715

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Identical to	EE50
First year	1939 Tube leaflet collection E.Erb Philips-Book [178]
First Source (s)	25.Aug.1938 : The Wireless World, London (WW, 79) p181

Base	Loctal-9-Pin (B9G) (Codex=Y)
Filament	Vf 6.3 Volts / If: 0.3 Ampere / -: Indirect / -: Parallel, (AC/DC) /
Description	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 It was quickly superceded by the EF50 - a standard pentode - of similar mechanical construction which has a lower noise figure.
Tube prices	0 Tube prices (visible for members only)
Literature	Taschenbuch zum Röhren-Codex 1948/49 - - Manufacturers Literature


	EE50: ficha de valvulas Getulio Jimenez-Gomez

EE50: K.H.Fischer
Karlheinz Fischer

EE50: RTT 1974 (Franzis) 13. Auflage
Martin Renz

EE50: rtt
Michael Schlör

Usage in Models	1= 1939??
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 1

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