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ID = 51612
United States of America (USA)
Brand: Zetka Laboratories; Newark
Developer: Zetka Laboratories; Newark 
Tube type:  Triode, vacuum   Universal 
Identical to ZP201A = UX201A = CX301A = 101A = 201A = 01A
First Source (s)
May.1927 : Radio Broedcast, May 1927, p.71

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Specified voltage AC/DC

So called Zetka Process (Z-P), "Power" tube being pin and heater compatible with ordinary 201A's (¼ amp). In fact hardly more than a good UX201A...

Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 47 g / 1.66 oz
Information source Saga of the Vacuum Tube, Tyne   p.365

ux_base_standard~~252.png ZP201A: Fin Stewart
Fin Stewart

Just Qvigstad

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