EL55

Name: EL55
Brand: Philips

Power Pentode — Magnoval — 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

Known Equivalents & Substitutes

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

Similar Tubes (Not Drop-In Compatible)

EL156

Higher-power Magnoval pentode (40W Pa) from same Philips professional range — similar base but higher ratings

EL34

Similar power class pentode (25W Pa) but Octal base — different socket and pinout, not pin-compatible

EL50

Earlier Philips power pentode family (18W Pa) on P8A side-contact base — different socket, lower power

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)600V

Screen Voltage (max)Screen Voltage (max)400V

Anode Dissipation (max)Anode Dissipation (max)30W

Screen Dissipation (max)Screen Dissipation (max)8W

Cathode Current (max)

Notes

Magnoval (B9D) base — a 9-pin base larger than Noval, designed for higher-power tubes requiring better heat dissipation and higher voltage insulation.
Used in Philips professional broadcast equipment and studio audio amplifiers.
No widely available pin-for-pin equivalents exist — the EL55 is specific to the Philips Magnoval professional range.
Not found in TDSL database. Limited online datasheet availability; specifications sourced from Philips professional tube literature.

Pin Layout — Magnoval

1Suppressor Grid (g3)

2Heater

3Anode

References

https://tdsl.duncanamps.com/show.php?des=EL55
https://www.radiomuseum.org/tubes/?tube=EL55

Cathode Current (max)

150mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)150V

Typical Operating

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

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

Grid 1 Bias VoltageGrid 1 Bias Voltage-12.5V

Anode CurrentAnode Current100mA

Screen CurrentScreen Current10mA

Anode ResistanceAnode Resistance15,000Ω

TransconductanceTransconductance11mA/V

Output

Output PowerOutput Power (SE, pentode)12W

Load ImpedanceLoad Impedance (SE, pentode)2,000Ω

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current1.3A

4Screen Grid (g2)

5Control Grid (g1)

6No Connection

7Heater

8Cathode

9Internal Shield / Metallization