Antique radios, Old Time Radios
Twin_Apco
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Country:
United States of America (USA)
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| Identical to |
Twin_Apco
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| Similar
Tubes |
Other base:
Twin_Apco_UV
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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 Apco twin triode was two tubes of the 201A style in one and was made from 1925 to 1926. It contained two complete sets of elements which were connected in parallel except for one end of each filament. When the first filament failed, the second could be brought into service by slightly unscrewing one of the filament pins in the base so that a switch arm could be moved from one contact to another. This bought the second filament into the circuit. The tube shown in the illustration in Tynes' book "Saga of the Vacuum Tube, page 347 shows that the tube probably had an outside frosted (acid etched) bulb.
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Dimensions (WHD)
incl. pins / tip |
x 108 x 45 mm / x 4.25 x 1.77 inch |
| Weight |
51 g / 1.80 oz |
| Information source |
Saga of the Vacuum Tube, Tyne Pages 347 and 351
-- Collector info (Sammler)
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Just Qvigstad
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Collection of
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