Tube-number record
RGQ 20/5
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RGQ 20/5 is a tube type in the TubeDatabase archive (class: Mercury Vapor Rectifier). Recorded specifications: brand Telefunken, construction Mercury Vapor, and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.
BrandTelefunken
ClassMercury Vapor Rectifier
Construction
Primary TypeMercury Vapor
Rectifier TypeHalf-wave
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage20000 V
Cathode Current5000 mA
Audio Performance
Key Features
- High efficiency
- Low internal voltage drop
- Directly heated oxide cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Two-phase circuit | 6400 V | — | — | — | 1000 mA |
| Three-phase circuit | 9600 V | — | — | — | 1200 mA |
| Graetz circuit | 19200 V | — | — | — | 1600 mA |
Application Notes
Heater voltage should be maintained at 5.0V +/- 5%. After transport, the tube must be operated for 45 minutes without anode voltage. Minimum preheating time of 1 minute required before applying anode voltage.
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