EC2

Small Signal Triode — P8A

Philips

Known Equivalents & Substitutes

AC2CC2TEC2VEC2VC2RE052

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max DC)550V

Anode Dissipation (max)Anode Dissipation (max)2W

Cathode Current (max)Cathode Current (max)10mA

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

Max Grid ResistorGrid Leak Resistance (max, anode circuit)1.5MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage250V

Grid 1 Bias VoltageGrid Voltage-5.5V

Anode CurrentAnode Current6mA

Anode ResistanceAnode Resistance12,000Ω

TransconductanceTransconductance

Capacitances

Grid-to-Plate CapacitanceAnode-to-Grid Capacitance1.7pF

Grid-to-Cathode CapacitanceGrid-to-Cathode Capacitance4.9pF

Anode-to-Cathode CapacitanceAnode-to-Cathode Capacitance4.5pF

other

Transconductance (max)Transconductance (max)3.5mA/V

Grid Leak Resistance (max, fixed bias)Grid Leak Resistance (max, fixed bias)1MΩ

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.4A

Notes

The characteristic curves of EC2, AC2, and CC2 are identical — all three are the same electrical design, differing only in heater supply designation.
Uses the pre-war P8A 8-pin side-contact base (Philips 'Sidekontakt'), which requires a period-correct socket and is incompatible with any modern standard socket without an adapter.

Pin Layout — P8A

1Anode

2Control Grid

3Cathode

4

References