EF184 — Small Signal Pentode, Noval | Tubeofile

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EF184

Small Signal Pentode — Noval

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Philips

↗ r-type.org ↗ TDSL ↗ Radiomuseum

Known Equivalents & Substitutes

6EJ76F266Zh51P6F30

Similar Tubes (Not Drop-In Compatible)

3EJ7

American designation for XF184 series-heater variant — not compatible with 6.3V parallel heater circuits

XF184

Series-heater variant — different heater requirements, not a drop-in for 6.3V circuits

Electrical Specifications

Section 1 — Pentode

Absolute Maximum

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

Screen Voltage (max)Screen Voltage (max)250V

Anode Dissipation (max)Anode Dissipation (max)2.5W

Screen Dissipation (max)Screen Dissipation (max)0.65W

Notes

Sharp-cutoff pentode — EF183 is the variable-mu (remote cutoff) equivalent with the same pinout and similar ratings.
Pin 6 is an internal shield (screen) connected internally — must be grounded for proper RF shielding.
Pins 1 and 3 are both cathode connections.
XF184 / 3EJ7 is the series-heater variant (different heater ratings, otherwise equivalent).
Triode-strapped data sourced from Tom Schlangen's 'Pentodes Strapped as Triodes' (2009) measurements, not from the manufacturer datasheet.

Pin Layout — Noval

1Cathode

2Control Grid

3Cathode

Socket-Compatible Tubes ⚠ Not electrically compatible

6F23 EF183 EF80 XF184

References

https://frank.pocnet.net/sheets/030/e/EF184.pdf
https://www.radiomuseum.org/tubes/tube_ef184.html

Cathode Current (max)

25mA

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

Max Grid ResistorMax Grid 1 Resistor1MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage200V

Screen Voltage (typical)Screen Voltage200V

Grid 1 Bias VoltageGrid 1 Bias Voltage-2.5V

Anode CurrentAnode Current10mA

Screen CurrentScreen Current3.8mA

Anode ResistanceAnode Resistance350,000Ω

TransconductanceTransconductance15mA/V

Capacitances

Grid-to-Plate CapacitanceCag1 (Grid-to-Anode Capacitance)0.005pF

Grid-to-Cathode CapacitanceCg1k (Grid-to-Cathode Capacitance)10pF

other

Cg1g2 (Grid 1 to Grid 2 Capacitance)Cg1g2 (Grid 1 to Grid 2 Capacitance)2.8pF

Section 2 — Triode Strapped

Absolute Maximum

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

Anode Dissipation (max)Anode Dissipation (max)2.5W

Cathode Current (max)Cathode Current (max)25mA

Typical Operating

Anode ResistanceAnode Resistance3,700Ω

TransconductanceTransconductance15mA/V

Amplification Factor (μ)Amplification Factor (μ)55—

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.3A

4Heater

5Heater

6Internal Shield

7Anode

8Screen Grid

9Suppressor Grid