Tube-number record
711000
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BrandPhilips
ClassMercury Vapour Rectifier
BaseJumbo
Construction
Primary TypeMercury Vapour
Rectifier TypeGrid-controlled
EnvelopeGlass
Base MaterialSuper Jumbo with bayonet
SectionsSingle
Filament / Heater
MaterialOxide-coated
Warm-up Time90s
Absolute Maximum Ratings
Plate Voltage21000 V
Grid 1 Voltage-300 V
Cathode Current5000 mA
Audio Performance
Key Features
- Grid-controlled
- Direct heating
- Mercury vapour filling
- Vertical mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Arc Drop | 12 V | — | — | — | 3000 mA |
Application Notes
After transport or long interruption, a 60-minute preheating time is required to ensure proper mercury distribution. Phase shift of 90 degrees recommended between anode and filament voltage.
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