Catalogue de radios anciennes
CV1234
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Pays:
Royaume Uni
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| Identique à |
CV1234
= W560
= NT57T
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| Culot |
SPECIAL TUBEBASE in general
Connexion par fils.
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| Chauffage |
Vf 9 Volt / If 35 Ampère / Direct |
| Description |
NT57T silica valve, with anode (left) and grid (right) wire connections at the top, and filament at the bottom, also wire connections only. This valve has two 'hairpin' filaments, each with a pair of wires. The NT57T is the thoriated filament version of the NT57, the first valve to be made specifically for use in radar. The NT86, developed from the NT57T, had three filaments.
Silica glass has a very high melting point (between 1500 and 1700 C) and a low coefficient of thermal expansion. Normal glass softens at around 450 C. Because of these properties, silica glass does not crack by heat.
The picture of this valve features on the cover of the August 2003 issue of "The Collector", published by the "Tube Collectors Association".
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| Bibliographie |
Taschenbuch zum Röhren-Codex 1948/49
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[rmxtube-fr, noindex]
| Mentions légales |
Plus d'informations |
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