Antique radios, Old Time Radios
456A
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Country:
United States of America (USA)
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| Identical to |
456A
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| Base |
Wires
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| Was used by |
Telephony |
| Filament |
--/-- |
| Description |
Protective gas diode for SD submarine cable system. Designed to protect other tubes and components both in case of abnormal voltages across each repeater, limiting that voltage to a safe value, and in case of heater open in one of the tubes, holding the heater voltage of the second amplifier at safe level. In case of failure of heaters on tubes of both amplifier, the tube fires and maintains the DC continuity in the system.
- Breakdown voltage 190 V
- Glow sustaining voltage 70 V
- Arc sustaining voltage 11 V
- Peak current 75 A
- Average current 450 mA
- Max energy 0.6 coulomb
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| Information source |
- - Manufacturers Literature
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