8270
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BrandAmperex
ClassHalf-wave Rectifier
BaseSuper Jumbo, 4 pins, with bayonet
Construction
Primary TypeGrid controlled mercury vapor
Rectifier TypeHalf-wave
EnvelopeGlass
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
- Mercury vapor
- Directly heated filament
- High voltage rectifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Maximum Ratings at 21kV PIV | 21000V | - | - | - | 2500mA |
| Maximum Ratings at 15kV PIV | 15000V | - | - | - | 3000mA |
| Maximum Ratings at 2.5kV PIV | 2500V | - | - | - | 5000mA |
Application Notes
A phase shift of 90 degrees +/- 30 degrees between anode and filament and/or use of a center-tapped filament transformer is recommended. After transport or long interruption, a 60-minute warmup is required.
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