Antique radios, Old Time Radios

SP4

Country:	Great Britain (UK)		Brand:	Mullard Radio Valve Co. Ltd.;
			Tube type:	Vacuum Pentode RF/IF-Stage

Tube ID = 10267

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Identical to	SP4 = E446
Similar Tubes	Normally replaceable-slightly different: T4600 Other base: 8A1_7pin

Base	Europe 5-Pin (O5A, B5) (Codex=Nc) Top contact screw type
Filament	Vf 4 Volts / If: 1.1 Ampere / -: Indirect / -: Parallel, (AC/DC) /
Description	1933 Mullard data quotes the heater current as 1.0A. Intended for use as first detector or freuency changer in superhets. Text in other languages (may differ)
Dimensions (WHD) incl. pins / tip	50 x 150 x mm / 1.97 x 5.91 x inch
Weight	63 g / 2.22 oz
Literature	Taschenbuch zum Röhren-Codex 1948/49 - - Manufacturers Literature

SP4: SP4
Frank Cuffe

SP4: Telefunken Werkstattbuch
Wolfgang Bauer

SP4: Mullard Valve Guide 1933-4
John Turrill

Usage in Models	7= 1931 ; 1= 1932? ; 2= 1933?? ; 10= 1933 ; 11= 1934? ; 19= 1934 ; 12= 1935
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 62

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