Tube-number record
5558
0 archive entries
5558 is a tube type in the TubeDatabase archive (class: Half-Wave Mercury-Vapor Rectifier). Recorded specifications: brand RCA, year 1953, construction Rectifier, base Medium-Shell Small 4-Pin Bayonet, socket 4-pin, and maximum plate voltage 5000 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassHalf-Wave Mercury-Vapor Rectifier
Base4-pin
Filament5 V @ 4500 mA
Construction
Primary TypeRectifier
Rectifier TypeHalf-Wave
EnvelopeST-23
Base MaterialMedium-Shell Small 4-Pin Bayonet
SectionsSingle
Filament / Heater
Heater NotesMin: 4.75V, Max: 5.25V; Current max: 4900mA. Heating time before conduction: 5 minutes.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Half-Wave Rectifier | 15 V | — | — | — | 2500 mA |
Application Notes
Requires vertical mounting, base down. Forced-air cooling may be required if condensed-mercury temperature limits are exceeded. Auxiliary heaters required for very low ambient temperatures.
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