EF54

Small Signal Pentode — Loctal

Mullard

Known Equivalents & Substitutes

VR136CV380CV1136

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)300V

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

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

Typical Operating

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

Screen Voltage (typical)Screen Voltage (typical)150V

Grid 1 Bias VoltageGrid 1 Bias Voltage-2.5V

Anode CurrentAnode Current10mA

Anode ResistanceAnode Resistance

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.3A

Notes

Military designation VR136 (UK). Designed for VHF amplifier service.
Loctal (B9G) base provides superior high-frequency performance over Octal types.
Widely used in WWII radar intermediate-frequency amplifier strips.

Pin Layout — Loctal

1Suppressor Grid (g3)

2Heater

3Anode (Plate)