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SP4/U1

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ID = 33288
       
Country:
Great Britain (UK)
Brand: Tungsram (Tube Brand), Tungsram Electric Lamp Works (Great Britain), Ltd.; London, British Tungsram Radio Works, Ltd.; London
Developer: Tungsram; Budapest (see also British T.) 
Tube type:  Vacuum Pentode   UHF 
Identical to SP4/U1
Base Europe side contact P8A (Au P, 8SC) 2 Top contacts.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Indirect / Specified voltage AC/DC
Description

This tube was designed by tungsram, Hungary as a special type of UHF tube for ultra short waves. It was designed with three cathode leads to minimise inductance feedback. Cathodes were connected by way of tthe two top caps.

 
Information source Wireless World (The), London (WW, 79)   p. 246, March 16th, 1939

Just Qvigstad
 
uk_sp4_u1.jpg

 
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