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12J5GT — Small Signal Triode, Octal | Tubeofile
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12J5GT
Small Signal Triode — Octal
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Known Equivalents & Substitutes
12J5
CV534
CV535
VT135
VT135A
12J5WGT
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Max Plate Voltage
300
V
Anode Dissipation (max)
Plate Dissipation (max)
2.5
W
Cathode Current (max)
Total Cathode Current (max)
20
mA
Heater-to-Cathode Voltage (max)
Heater-Cathode Voltage (max)
90
V
Max Grid Resistor
Max Grid Resistor
1
MΩ
Typical Operating
Anode Voltage (typical)
Plate Voltage
250
V
Grid 1 Bias Voltage
Grid Bias Voltage
-8
V
Anode Current
Plate Current
9
mA
Anode Resistance
Plate Resistance
7,700
Ω
Transconductance
Transconductance
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
3.4
pF
Input Capacitance
Input Capacitance
3.4
pF
Output Capacitance
Output Capacitance
3.6
pF
Heater
Heater Voltage
Heater Voltage
12.6
V
Heater Current
Heater Current
0.15
A
Notes
Electrically identical to the 6J5/6J5GT except for heater voltage (12.6V vs 6.3V).
Heater-cathode voltage should be kept to a minimum if direct connection is not possible (GE datasheet). Max Vhk = 90V DC.
Pin 1 (shell) should be connected to cathode per GE datasheet.
The d-c resistance in the grid circuit under maximum rated conditions should not exceed 1.0 megohm.
Pin Layout — Octal
1
2
3
4
5
6
7
8
1
Shell
2
Heater
3
Plate
4
Socket-Compatible Tubes
⚠ Not electrically compatible
6J5
References
https://frank.pocnet.net/sheets/201/1/12J5GT.pdf
https://frank.pocnet.net/sheets/201/1/12J5.pdf
2,600
mA/V
Amplification Factor (μ)
Amplification Factor
20
—
No Connection
5
Grid
6
No Connection
7
Heater
8
Cathode