Antique radios, Old Time Radios
PA112A
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Country:
United States of America (USA)
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| Identical to |
PA112A
= 112A
= 12A
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| First Source
(s) |
1929 : -- Original prospect or advert
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| Base |
UX-Base (4 Pins (2 thick, USA 1924, UX)
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 5 Volts / If 0.25 Ampere / Direct / Battery = |
| 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 the element base. This had the necessary wires through it for sturdiness, insulation and parallel alignment. The second bridge was placed on top of the element structure. In directly heated tubes, the top of 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 this tube variation was commercially available.
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Dimensions (WHD)
incl. pins / tip |
x 108 x 45 mm / x 4.25 x 1.77 inch |
| Information source |
Radio (magazine) Nov. 1929 page 61
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PA112A: Fin Stewart
Fin Stewart
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Just Qvigstad
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PA112A: Manufacturer's Literature 1929
Anonymous 15 Collector
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