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SP4

Information - Help 
ID = 10267
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to SP4 = E446
Similar Tubes
Normally replaceable-slightly different:
  AC/SP ; ACHN4 ; T4600
Other base:
  8A1_7pin

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (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
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
mullard_sp4.jpg
SP4: SP4
Frank Cuffe

 
13_5~~2.png
SP4: Telefunken Werkstattbuch
Wolfgang Bauer

 
gb_mullard_sp4.png
SP4: Mullard Valve Guide 1933-4
John Turrill


from Just Qvigstad

Usage in Models 7= 1931 ; 1= 1932? ; 1= 1932 ; 2= 1933?? ; 11= 1933 ; 13= 1934? ; 22= 1934 ; 3= 1935? ; 13= 1935 ; 1= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):74


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