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EL2 — Power Pentode, P8A | Tubeofile | Tubeofile

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EL2

Name: EL2
Brand: Philips

Power Pentode — P8A — Philips

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Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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Known Equivalents & Substitutes

CV1429

Similar Tubes (Not Drop-In Compatible)

EL42

Rimlock successor for car radios with same heater current (0.2 A) — different base, improved performance

EL95

Noval successor for low-power automotive/portable use — different base, higher gm

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max, no signal)550V

Screen Voltage (max)Screen Voltage (max, no signal)550V

Anode Dissipation (max)Anode Dissipation (max)8W

Screen Dissipation (max)Screen Dissipation (max)1.6W

Notes

Designed for DC series or parallel heater operation from car batteries; suitable for vibrator-type power supplies.
Low heater current (0.2 A) enables direct operation from 6 V accumulators in series with other tubes.
Class A at Va=200V delivers 2.3 W at 10% THD; at Va=250V delivers 3.6 W at 10% THD.
Class AB push-pull at Va=250V delivers 8 W output with two tubes.
Grid resistor max 1 MΩ with automatic bias, max 0.6 MΩ with fixed bias.
Maximum heater-to-cathode voltage is 100 V.

Pin Layout — P8A

1Control Grid

2Cathode

3Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

4694 AL3 AL5 AL5/375 EL3 EL3/375 EL3N EL5 EL53 EL54

References

https://frank.pocnet.net/sheets/030/e/EL2.pdf

Cathode Current (max)

45mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)100V

Max Grid ResistorMax Grid Resistor (automatic bias)1MΩ

Typical Operating

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

Screen Voltage (typical)Screen Voltage (typical)250V

Grid 1 Bias VoltageGrid 1 Bias Voltage-18V

Anode CurrentAnode Current32mA

Screen CurrentScreen Current5mA

Anode ResistanceAnode Resistance70,000Ω

TransconductanceTransconductance3mA/V

Cathode Resistor (self-bias)Cathode Resistor (self-bias)480Ω

Output

Output PowerOutput Power (10% THD)3.6W

Load ImpedanceOptimum Load Impedance8,000Ω

other

Screen Voltage (max, operating)Screen Voltage (max, operating)300V

Anode Voltage (max, operating)Anode Voltage (max, operating)300V

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.2A

Heater

5Screen Grid

6Metallization (external shield)

7Suppressor Grid (internally connected to cathode)

8No Connection

TCTop Cap —Anode (top cap)