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EL6 — Power Pentode, B8A | Tubeofile | Tubeofile

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EL6

Name: EL6
Brand: Philips

Power Pentode — B8A — 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.

↗ TDSL ↗ Radiomuseum

Known Equivalents & Substitutes

WE14EL6E4699

Similar Tubes (Not Drop-In Compatible)

EL54

Same electrical structure and characteristics but on P8A (European side-contact with top-cap anode) instead of EL6's B8A (Octal-class side-contact). Not a pin-for-pin drop-in despite identical specs — requires a different socket.

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)250V

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

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

Screen Dissipation (max)Screen Dissipation (max, quiescent)2W

Cathode Current (max)

Notes

Uses B8A (Philips side-contact Octal) base with top-cap anode connection. Not compatible with standard Octal (IO) sockets.
Brans Vademecum lists 6GK6 and 6P15 as equivalents, but these use different bases (7-pin miniature and B9A respectively) and are not pin-compatible.

Pin Layout — B8A

1No Connection

2Heater

3Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

EL50 EL51

References

https://frank.yueksel.org/sheets/005/e/EL6.pdf
https://frank.yueksel.org/sheets/102/e/EL6.pdf

Cathode Current (max)

90mA

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

Max Grid ResistorGrid Resistor (max)0.7MΩ

Typical Operating

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

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

Grid 1 Bias VoltageGrid 1 Bias Voltage-7V

Anode CurrentAnode Current (quiescent)72mA

Screen CurrentScreen Current (quiescent)8mA

Anode ResistanceAnode Resistance20,000Ω

TransconductanceTransconductance14.5mA/V

Cathode Resistor (self-bias)Cathode Resistor (self-bias, SE)99Ω

Output

Output PowerOutput Power (single-ended)8.2W

Load ImpedanceLoad Impedance (single-ended)3,500Ω

Capacitances

Grid-to-Plate CapacitanceFeedthrough Capacitance (Gitter-Anodenkapazität)0.7pF

other

Total Harmonic Distortion (PP, full drive)Total Harmonic Distortion (PP, full drive)2.2%

Output Power (PP Class AB, Va=250V, Vs=265V)Output Power (PP Class AB, Va=250V, Vs=265V)13.3W

Load Impedance (anode-to-anode, PP)Load Impedance (anode-to-anode, PP)5,000Ω

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current1.2A

4Cathode

5Suppressor Grid (g3)

6Control Grid (g1)

7Screen Grid (g2)

8No Connection

topAnode (top cap)