Tube-number record
DCG 12/30
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BrandPHILIPS
ClassGrid-controlled Mercury Vapour Rectifier
BaseSpecial / none
Construction
Primary TypeRectifier
Rectifier TypeMercury Vapour
EnvelopeGlass
Base MaterialStandard
SectionsSingle
Filament / Heater
MaterialOxide-coated
Warm-up Time90s
Absolute Maximum Ratings
Plate Voltage27000 V
Grid 1 Voltage-300 V
Cathode Current2500 mA
Audio Performance
Key Features
- Grid-controlled
- Mercury vapour filling
- Directly heated filament
- Natural convection cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier at 27kV Va invp | 27000 V | — | — | — | 2500 mA |
| Rectifier at 10kV Va invp | 10000 V | — | — | — | 2500 mA |
Application Notes
A phase shift of 90+/-30 degrees between grid and plate voltage or use of a center-tapped filament transformer is recommended. After transport or long service interruption, a 60-minute preheating time is required to ensure mercury distribution.
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