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EF54 — Small Signal Pentode, Loctal | Tubeofile
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EF54
Small Signal Pentode — Loctal
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Mullard
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↗ Radiomuseum
Known Equivalents & Substitutes
VR136
CV380
CV1136
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
250
V
Anode Dissipation (max)
Anode Dissipation (max)
2.5
W
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Screen Voltage (typical)
150
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-2.5
V
Anode Current
Anode Current
10
mA
Anode Resistance
Anode Resistance
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.3
A
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
1
2
3
4
5
6
7
8
9
1
Suppressor Grid (g3)
2
Heater
3
Anode (Plate)
500,000
Ω
Transconductance
Transconductance
6.5
mA/V
4
Screen Grid (g2)
5
Control Grid (g1)
6
No Connection
7
Heater
8
Cathode
9
Shell/Shield