Antique radios, Old Time Radios
PR280
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Country:
United States of America (USA)
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| Identical to |
PR280
= 280
= 80
= UX280
= CX380
= 480
= 180
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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 2 Ampere / Direct / Specified voltage AC/DC |
| Description |
The advertisement in "Radio" November 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 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.
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Dimensions (WHD)
incl. pins / tip |
x 137 x 54 mm / x 5.39 x 2.13 inch |
| Weight |
67 g / 2.36 oz |
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PR280: Fin Stewart
Fin Stewart
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Just Qvigstad
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PR280: Manufacturer's Literature 1929
Anonymous 15 Collector
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