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AK 1  
Country:  Europe      Brand:  Common tube type Europe 
  Developer:  Philips; - Eindhoven; Netherlands 
  Tube type:  OCTODE   Frequency converter   Controlling (mu) 
Identical to AK1 = TK1 = MO465 = WE21
Similar Tubes AK2 (other base)   A4GDR (can normally be replaced - small diff'ce)   BK1 (Heater different)   NMO46 (can normally be replaced - small diff'ce)  
First Series   Mar.1934 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s) Mar.1934 : Philips Bulletin
Feb.1934 : Toute la radio # 1
Predecessor Tubes RENS1224   E448   X4122  
Successor Tubes AK2  

Base Europe 7-Pin (C7A, C, 1933) (Codex=Leo) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament -: Indirect / If: 0.65 Ampere / Vf 4 Volts /
Tube prices 1 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   Design = Philips