4E27A/5-125B
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BrandEimac
ClassRadial-Beam Power Pentode
Base7-pin metal shell
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation125 W
Grid 2 Voltage750 V
Grid 1 Voltage-500 V
Cathode Current200 mA
Audio Performance
Key Features
- Low driving-power requirement
- Simplified neutralization
- Convection and radiation cooling
- Radial-beam construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class-C Telegraphy | 3000V | 2150 | - | 5 | 167mA |
| Class AB1 Modulator (Two Tubes) | 2500V | - | 20000 | - | 220mA |
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