EL51

Power Pentode — B8A

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Philips

Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max operational)750V

Screen Voltage (max)Screen Voltage (max operational)750V

Anode Dissipation (max)Anode Dissipation (max)45W

Screen Dissipation (max)Screen Dissipation (max, full drive)25W

Cathode Current (max)Cathode Current (max)200mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)50V

Max Grid ResistorGrid Resistor (max, self-bias)0.7MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)500V

Screen Voltage (typical)Screen Voltage (typical)500V

Grid 1 Bias VoltageGrid 1 Bias Voltage-22V

Anode CurrentAnode Current (quiescent)95mA

Screen CurrentScreen Current (quiescent)

Output

Output PowerOutput Power (PP Class AB, Va=500V)70W

Load ImpedanceLoad Impedance (anode-to-anode, PP)4,800Ω

Capacitances

Grid-to-Plate CapacitanceFeedthrough Capacitance (průchodní kapacita)1.5pF

other

Screen Dissipation (max, quiescent)Screen Dissipation (max, quiescent)7W

Grid Resistor (max, fixed bias)Grid Resistor (max, fixed bias)0.2MΩ

Output Power (PP Class AB fixed bias, Va=750V)Output Power (PP Class AB fixed bias, Va=750V)125W

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current1.9A

Pin Layout — B8A

1No Connection

2Heater

3Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

EL50 EL6

References

https://frank.pocnet.net/sheets/183/e/EL51.pdf
https://www.radiomuseum.org/tubes/tube_el51.html

12mA

Anode ResistanceAnode Resistance33,000Ω

TransconductanceTransconductance11mA/V

Cathode Resistor (self-bias)Cathode Resistor (self-bias, PP)100Ω

4Cathode

5Suppressor Grid (g3)

6Control Grid (g1)

7Screen Grid (g2)

8No Connection

topAnode (top cap)