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615_Marathon

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ID = 30812
       
Country:
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 
Identical to 615_Marathon

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
Description

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 has an amplification factor of 12, anode impedance of 19000 Ohms and mutual conductance of 635 micromhos.

 
Information source Saga of the Vacuum Tube, Tyne   Page 345

marathon_ac_ux_base~~1.png 615_Marathon: Fin Stewart
Fin Stewart


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