XF184 — Small Signal Pentode, Noval | Tubeofile

XF184

Small Signal Pentode — Noval

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Philips

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Known Equivalents & Substitutes

3EJ7

Similar Tubes (Not Drop-In Compatible)

6EJ7

American designation of EF184 — 6.3 V parallel heater, not series-string compatible

EF184

Identical electricals but 6.3 V parallel heater — not a drop-in in series-string heater 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

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

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 Current

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

Heater

Heater VoltageHeater Voltage3.6V

Heater CurrentHeater Current0.6A

Notes

Series-heater (600 mA) version of the EF184. Electrically identical sections — only the heater voltage/current differs (3.6 V at 600 mA vs 6.3 V at 300 mA).
3EJ7 is the American RETMA designation for the XF184.
Sharp-cutoff pentode — the variable-mu (remote cutoff) equivalent is the EF183/XF183.
Pin 6 is an internal shield (screen) connected internally — must be grounded for proper RF shielding.
Pins 1 and 3 are both cathode connections.
Brans Vademecum also lists YF184 as an equivalent.

Pin Layout — Noval

1Cathode

2Control Grid

3Cathode

Socket-Compatible Tubes ⚠ Not electrically compatible

6F23 EF183 EF184 EF80

References

https://frank.pocnet.net/sheets/030/x/XF184.pdf