AL5/375

Power Pentode — P8A

Philips

Known Equivalents & Substitutes

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

Similar Tubes (Not Drop-In Compatible)

AL5

Standard version rated to 275 V — same P8A base and pinout

EL12/375

6.3 V heater version with Y8A base — different base, not pin-compatible

6.3 V heater version of AL5 — same characteristics except heater

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)375V

Screen Voltage (max)Screen Voltage (max)275V

Anode Dissipation (max)Anode Dissipation (max)18W

Cathode Current (max)Cathode Current (max)90mA

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

Max Grid ResistorGrid Resistance (max)0.7MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)250V

Screen Voltage (typical)Screen Voltage (typical)275V

Grid 1 Bias VoltageGrid Bias Voltage-14V

Anode CurrentAnode Current72mA

Screen CurrentScreen Current

Output

Output PowerOutput Power (Class A SE, D=10%)9.1W

Load ImpedanceOptimum Load Resistance3,500Ω

Heater

Heater VoltageHeater Voltage4V

Heater CurrentHeater Current2A

Notes

The '/375' suffix indicates factory selection for Va_max = 375 V operation.
Must be used with self-bias (automatic grid bias) only — fixed bias operation is prohibited.
At full automatic grid bias: Rk = 175 ohm.
Electrically identical to EL5 apart from heater characteristics. Refer to AL5/EL5 data for curves.
Brans lists equivalents: 4654(P), 4654K, 4689(P), EL12/375, EL12spez, EL35, EL50.

Pin Layout — P8A

1Control Grid (g1)

2Cathode

3Heater

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References