6F31

Tube ID = 3628


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Identical to	6F31

Filament

K.H.Fischer
Karlheinz Fischer

Tesla catalogue
Gabriel Toth

Usage in Models (calculation each 25th of the month)	1= 1952?? ; 1= 1953?? ; 5= 1953 ; 2= 1954? ; 1= 1954 ; 1= 1955?? ; 8= 1955 ; 1= 1956?? ; 3= 1956 ; 7= 1957 ; 17= 1958 ; 1= 1959? ; 3= 1959 ; 4= 1960 ; 1= 1961 ; 1= 1962?? ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 57

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6F31

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