EFF 51
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BrandPHILIPS
ClassTwin H.P. Pentode
Filament6.3V @ 0.38mA
Construction
Primary TypePentode
SectionsTwin
Filament / Heater
Absolute Maximum Ratings
Plate Voltage300 V
Grid 2 Voltage225 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage50 V
Audio Performance
Key Features
- U.S.W. AMPLIFICATION
- PUSH-PULL CONNECTION
- UP TILL 500 MHz
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| per system | 250V | 7500 | 350000 | - | 6mA |
| per system | 300V | 9000 | 250000 | - | 10mA |
Application Notes
Operating frequencies up to 500 MHz. Damping resistance Relg1 is 730 Ohms at λ = 1.5 m.
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