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ID = 78581
Brand: Apollo アポロ (tube brand) - Nihon Ko-on Kogyo / Taiyo Denshi Kenkyshuso; Tokyo
Tube type:  Pentagrid-Converter (Heptode) 
Identical to 17MSF

Base Miniatur-7-Pin-Base B7G, USA 1940
Was used by Radio/TV-reception etc.
Filament Vf 1.5 Volts / If 0.027 Ampere / Direct / Battery =

Japanese Character printed on the envelope. Bakelite tube base.

Dimensions (WHD)
incl. pins / tip
15 x 46 x mm / 0.59 x 1.81 x inch

17MSF: Hand traced from Bamby radio by Nitto
Joe Sousa

17msf_pinout.gif 17MSF: Hand drawn
Joe Sousa

Just Qvigstad
17MSF: Curve tracings in Tektronix 575 curve tracer
Joe Sousa

More ...
Usage in Models 1= 1955??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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