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12SC7 — Small Signal Triode, Octal | Tubeofile
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12SC7
Small Signal Triode — Octal
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Known Equivalents & Substitutes
CV540
VT268
Similar Tubes (Not Drop-In Compatible)
6SC7
Electrically identical but 6.3V/0.3A heater — not a drop-in in 12.6V series heater circuits
6SL7GT
Similar high-mu twin triode successor but sections have separate cathodes — different circuit topology
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Max Plate Voltage
250
V
Heater-to-Cathode Voltage (max)
Max Heater-Cathode Voltage
90
V
Max Grid Resistor
Max Grid Resistor
0.5
MΩ
Typical Operating
Anode Voltage (typical)
Plate Voltage
250
V
Grid 1 Bias Voltage
Grid Voltage
-2
V
Anode Current
Plate Current
2
mA
Anode Resistance
Plate Resistance
53,000
Ω
Transconductance
Transconductance
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
2
pF
Input Capacitance
Input Capacitance
2
pF
Output Capacitance
Output Capacitance
3
pF
Heater
Heater Voltage
Heater Voltage
12.6
V
Heater Current
Heater Current
0.15
A
Notes
12.6V heater version of the 6SC7. Heater current is 0.15A at 12.6V (vs 0.3A at 6.3V for the 6SC7).
GE Essential Characteristics confirms: 12.6V/0.15A heater, Octal (8S) base, high-mu twin triode, Va_max=250V, ra=53000 ohms, gm=1325 umhos, mu=70.
Both triode sections share a common cathode (pin 6). This makes the 12SC7 particularly suited for phase-inverter service.
Pin 1 (shell) is internally connected to pin 6 (cathode) on the metal-envelope version.
Brans Vademecum lists CV540 and VT268 as equivalents.
Pin Layout — Octal
1
2
3
4
5
6
7
8
1
Shell (internally connected to Cathode)
2
Plate 2 (Triode section 2)
3
Grid 2 (Triode section 2)
Socket-Compatible Tubes
⚠ Not electrically compatible
6SC7
References
https://frank.pocnet.net/sheets/093/6/6SC7.pdf
1.325
mA/V
Amplification Factor (μ)
Amplification Factor
70
—
4
Grid 1 (Triode section 1)
5
Plate 1 (Triode section 1)
6
Cathode
7
Heater
8
Heater