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ID = 5542
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Tetrode   VHF 
Identical to 17C9A

Base Noval+1 (10= center pin) = B10G = E10-73
Filament Vf 16.8 Volts / If 0.15 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Description Not really sure if the base designation is correct, assuming it is a slightly different 17C9 - having the same If and Uf. 
Information source Essential Characteristics, GE 1973   

17c9a_sockel.png 17C9A: Essential characteristics
Peter Hoddow

Just Qvigstad

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