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ID = 72497
United States of America (USA)
Brand: Perryman Electric Co., Inc.; North Bergen, NJ
Tube type:  Triode, vacuum   Power/Output 
Identical to PA210A = 210A
First Source (s)
1929 : -- Original prospect or advert

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 4.5 Volts / If 1 Ampere / Direct / Parallel, (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 spacers, one placed between the press and the 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 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 137 x 54 mm / x 5.39 x 2.13 inch
Information source Radio (magazine)   November 1929, page 61
PA210A: Ebay item February 2017
Fin Stewart

PA210A: Fin Stewart
Fin Stewart

PA210A: Manufacturer's Literature 1929
Anonymous 15 Collector

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