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ID = 28979
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   Detector 
Identical to 608
First year 1927 Saga of the Vacuum Tube, Tyne page 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. Usually sold with a Marathon AC kit, consisting of a cable with the necessary clips to connect the heaters. This tube had an amplification factor of 7.3, anode impedance of 9500 Ohm and a mutual conductance of 75 microhmos.

Dimensions (WHD)
incl. pins / tip
x 119 x 45 mm / x 4.69 x 1.77 inch
Weight 57 g / 2.01 oz
Information source Saga of the Vacuum Tube, Tyne   Page 345
-- Collector info (Sammler)   
608: my collection
Matt Endicott

608: own collection
Peter den Boer


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