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ID = 72496
United States of America (USA)
Brand: Perryman Electric Co., Inc.; North Bergen, NJ
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Power/Output 
Identical to PA171A = 171A
Similar Tubes
Normally replaceable-slightly different:
  CX371A ; UX171A
First Source (s)
1929 : -- Original prospect or advert

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Specified voltage AC/DC
Description The advertisement in "Radio", Nov. 1929, page 61 shows that this tube was fitted with the patented ceramic Perryman Bridge. This was two special spacers., one placed between the press and element base. This had the necessary wires pass through it for sturdiness, insulation and alignment. The second bridge was on top of the element structure. In directly heated tubes, the filament was also held in place with a tension spring. The element structure would have been expensive to make and it is not known how long this tube variation was commercially available. 
Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Information source Radio (magazine)   November 1929, page 61

ux_base_standard~~100.png PA171A: Fin Stewart
Fin Stewart

Just Qvigstad
PA171A: Manufacturer's Literature 1929
Anonymous 15 Collector


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