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EF92 — Small Signal Pentode, B7G | Tubeofile
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EF92
Small Signal Pentode — B7G
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Mullard
Data: Medium
Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
6CQ6
W77
CV131
6F21
9D6
Similar Tubes (Not Drop-In Compatible)
6065
Slightly different variant
CV4015
Military premium-grade version
M8161
Higher quality grade of the same design
Electrical Specifications
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Screen Voltage (typical)
200
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-2.5
V
Anode Current
Anode Current
8
mA
Screen Current
Notes
Variable-mu pentode suitable for AGC-controlled RF/IF amplifier stages.
Very low grid-anode capacitance (0.004 pF) permits stable operation at high frequencies without neutralisation.
Calculated amplification factor mu = gm x ra = 2.5 x 1000 = 2500.
Pin Layout — B7G
1
2
3
4
5
6
7
1
Anode (Plate)
2
Screen Grid (g2)
3
Heater
4
References
https://frank.pocnet.net/sheets/050/e/EF92.pdf
Screen Current
2.1
mA
Anode Resistance
Anode Resistance
1,000,000
Ω
Transconductance
Transconductance
2.5
mA/V
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
0.004
pF
Grid-to-Cathode Capacitance
Grid-to-Cathode Capacitance
4.5
pF
Anode-to-Cathode Capacitance
Anode-to-Cathode Capacitance
7
pF
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.2
A
Heater
5
Suppressor Grid (g3)
6
Cathode
7
Control Grid (g1)