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PA250

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ID = 72498
       
Country:
United States of America (USA)
Brand: Perryman Electric Co., Inc.; North Bergen, NJ
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Triode, vacuum   Power/Output 
Identical to PA250 = 250 = 50 = 450 = UX250 = CX350
Similar Tubes
Normally replaceable-slightly different:
  U250
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 7.5 Volts / If 1.25 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 parallel alignment. The second bridge was placed on top of the element structure. In directly heated tubes, the filament was also held in place with a tension spring. This 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 159 x 67 mm / x 6.26 x 2.64 inch
Weight 78 g / 2.75 oz

ux_base_standard~~105.png PA250: Fin Stewart
Fin Stewart


Just Qvigstad
1usa_perryman_radio1929_3~~7.png
PA250: Manufacturer's Literature 1929
Anonymous 15 Collector

 

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