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MR4

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ID = 14525
       
Country:
Hungary
Brand: Tungsram; Budapest (see also British T.)
Tube type:  Triode, vacuum   Power/Output 
Identical to MR4
First Source (s)
Apr.1927 : Funk Bastler #14

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   undated data sheet
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren

b4_base_pins~~294.png MR4: Fin Stewart
Fin Stewart


Just Qvigstad
1925_12tungsrammr4_mr41.png
MR4: Typenkarten Audionröhren Dez. 1925
Thomas Lebeth

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Usage in Models 1= 1926

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
 
h_tungsram_mr4_front.jpg

 

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