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ID = 38963
United States of America (USA)
Brand: Marathon (tubes), Northern Manufacturing Co.; Newark, NJ
Developer: Marathon (tubes), Northern Manufacturing Co.; Newark, NJ 
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to 608R
First year 1927 Saga of the Vacuumtube, Tyne p.345

Base UX-Base (4 Pins (2 thick, USA 1924, UX) 2 Sidecontacts
Was used by Radio/TV-reception etc.
Filament Vf 5.5 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)

Early AC tubes for conversion of battery radios. The filament was connected to side terminals on the tube base. This tube was used as an amplifier.

Usually sold with a Marathon AC kit, consisting of a cable with the necessary clips to connect the heaters.

Literature Saga of the Vacuumtube, Tyne   p.346
608R: O.F.
Otto Frosinn

608R: own collection
Peter den Boer


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