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XXFM

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ID = 3745
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Diode-Triode 
Identical to XXFM = 7X7

Base Loctal-8, B8G (Sylvania, 1938) (Codex=We)
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description Early code for 7X7 
Information source Taschenbuch zum Röhren-Codex 1948/49   

581_1.png XXFM: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
xxfm.png
XXFM: Röhren-Vademekum 1947
Helmut Weigl

Usage in Models 11= 1941

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):11

Collection of

 
xxfm_rm.jpg

 

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