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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 = ACHM4
Similar Tubes
Normally replaceable-slightly different:
  AC/SP ; ACHN4 ; T4600
Other base:
  8A1_7pin
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Nc) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.1 Ampere / Indirect / Specified voltage 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 History of the British Radio Valve to 1940   [p. 142, 194 & 196
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49

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


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

Usage in Models 7= 1931 ; 1= 1932? ; 1= 1932 ; 2= 1933?? ; 11= 1933 ; 13= 1934? ; 22= 1934 ; 2= 1935? ; 14= 1935

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):73

Collection of

 
mullard_sp4.jpg

SP4
 

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