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PenA4 — Power Pentode, B7G | Tubeofile | Tubeofile
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PenA4
Power Pentode — B7G — Mullard
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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.
↗ Radiomuseum
Known Equivalents & Substitutes
CV1329
Pen4VB
Similar Tubes (Not Drop-In Compatible)
EL5
Related Philips output pentode — similar power class but different base and characteristics
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
250
V
Screen Voltage (max)
Auxiliary Grid Voltage (max)
250
V
Anode Dissipation (max)
Anode Dissipation (max)
9
W
Max Grid Resistor
Grid Resistance (max)
1
MΩ
Typical Operating
Notes
Quick-heating cathode — should only be used with the IW4/350 rectifier.
Pen4VB has identical characteristics except for heating time.
Grid resistance max = 1 Mohm.
Cathode bias resistor: Rk = 145 ohms.
Range of grid voltage for 1 uA grid current: Vg1 = -0.3 to -0.8 V.
Brans lists equivalents: BL2, CV1329, D12F, EL5, PEN4VB.
Pin Layout — B7G
1
2
3
4
5
6
7
1
No Connection
2
Control Grid (G1)
3
Auxiliary Grid (G2)
4
References
https://frank.pocnet.net/sheets/153/p/PENA4.pdf
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Auxiliary Grid Voltage (typical)
250
V
Grid 1 Bias Voltage
Grid Bias Voltage (Ia=36mA)
-5.8
V
Anode Current
Anode Current
36
mA
Screen Current
Auxiliary Grid Current
5
mA
Anode Resistance
Anode Impedance
50,000
Ω
Transconductance
Mutual Conductance (Ia=36mA)
9.5
mA/V
Cathode Resistor (self-bias)
Cathode Bias Resistor
145
Ω
Output
Output Power
Output Power (D=10%, 3rd H.)
3.8
W
Load Impedance
Optimum Load Resistance
8,000
Ω
Heater
Heater Voltage
Heater Voltage
4
V
Heater Current
Heater Current
1.95
A
Heater
5
Heater
6
Cathode
7
Anode