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ID = 3305
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to 506K
Similar Tubes
Other shape (e.g. bulb type):
Heater different:
First year 1927 Tube leaflet collection E.Erb Analysis by original leaflets
Predecessor Tubes 2506  
Successor Tubes 1932   1805  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 1 Ampere / Direct

K means "kort" = dutch for "short".
506K is ca. 20mm shorter than the normal 506.
Only this version fits into the Philips Radio Model 2514.

Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1951   Fehler: Daten der 509 angegeben!
Babani, International Radio Tube Encyclopaedia
  506K: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
John Hupse
506K: scc
Christian Schaufelberger

506K: Telefunken Werkstattbuch
John Hupse


from Just Qvigstad

Usage in Models 2= 1928 ; 1= 1929?? ; 5= 1929 ; 1= 1930?? ; 6= 1930? ; 6= 1930 ; 2= 1931? ; 2= 1931 ; 1= 1935?? ; 1= 1935 ; 1= 1936

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):28

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