Radio Antica e Radio d'epoca
GT1C
| Zoccolo |
Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
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| Utilizzata per |
Radio/TV-reception etc. |
| Filamento |
Vf 4 Volt / If 1.3 Ampere / Indirect / Specified voltage AC/DC |
| Descrizione |
This tube was developed for use in television timebases when the UK London service opened. They were also used in the temperature control system of the British Post Office Quartz Clocks. They were apparently the least reliable component of the clocks and would fail unpredictably causing frequency variations. This was fixed by running two tubes in parallel and provided monitoring for failure.
Va<500 peak. Ia<300mA mean, 1A peak. (Osram data 1938). The impedance of the anode circuit must ensure that the current can never exceed 1.0 amp. Special attention must be given to this point in circuits where the GT1C discharges a condenser.
Cathode preheat time of >30 seconds is essential to prevent premature ageing.
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Dimensioni
(LxAxP)
incl.pins/tip |
45 x 120 x mm / 1.77 x 4.72 x inch |
| Peso |
56 g / 1.98 oz |
| Bibliografia |
British Radio Valves - The Classic Years: 1926-1946 Supplement, p. 155
- - Manufacturers Literature Osram data 1938, GEC Nov 1949
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
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GT1C: Tabu Röhren-Codex, 1948
Anonimo 15 Collezionista
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Just Qvigstad
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GT1C: own collection
Peter den Boer † 2025
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