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12W6GT — Beam Tetrode, Octal | Tubeofile | Tubeofile

12W6GT

Beam Tetrode — Octal

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Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

Electrically identical but 25V/0.3A heater — not a drop-in substitute

Electrically identical but 6.3V/1.2A heater — not a drop-in in 12.6V series heater circuits

Electrical Specifications

Section 1 — Beam Tetrode

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)330V

Screen Voltage (max)Screen Voltage (max)165V

Anode Dissipation (max)Anode Dissipation (max)12W

Screen Dissipation (max)Screen Dissipation (max)1.35W

Notes

12.6V heater version of the 6W6GT. Heater current is 0.6A at 12.6V (vs 1.2A at 6.3V for the 6W6GT). Same heater power consumption, different voltage/current ratio for series-string operation.
Brans Vademecum groups the 12W6GT with a large family including 6W6GT, 25L6GT, 6DG6GT, 12C5, 6CA5, and many other beam power types with similar characteristics.
Electrically identical to the 6W6GT — same section specs, same operating conditions, same output power.
Pin 8 connects cathode and suppressor grid (beam-forming plates) internally.

Pin Layout — Octal

1No Connection

2Heater

3Anode (Plate)

4

Socket-Compatible Tubes ⚠ Not electrically compatible

12AV5 12AX4 12DQ6 12E1 12J5 12J5GT 1H4 25L6GT 350B 367A 5881 6550 6A5G 6C2C 6CD6G

References

https://frank.pocnet.net/sheets/127/6/6W6GT.pdf

Cathode Current (max)

Cathode Current (max)

65mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)200V

Max Grid ResistorMax Grid Resistor (cathode bias)0.5MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)200V

Screen Voltage (typical)Screen Voltage (typical)125V

Grid 1 Bias VoltageGrid 1 Bias Voltage0V

Anode CurrentAnode Current46mA

Screen CurrentScreen Current2.2mA

Anode ResistanceAnode Resistance28,000Ω

TransconductanceTransconductance8mA/V

Cathode Resistor (self-bias)Cathode Resistor (self-bias)180Ω

Output

Output PowerOutput Power3.8W

Load ImpedanceLoad Impedance4,000Ω

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance0.8pF

Input CapacitanceInput Capacitance15pF

Output CapacitanceOutput Capacitance9pF

Section 2 — Triode Strapped

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)330V

Anode Dissipation (max)Anode Dissipation (max)8.5W

Cathode Current (max)Cathode Current (max)65mA

Max Grid ResistorMax Grid Resistor (cathode bias)2.2MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage225V

Grid 1 Bias VoltageGrid 1 Bias Voltage-30V

Anode CurrentAnode Current22mA

Anode ResistanceAnode Resistance1,600Ω

TransconductanceTransconductance3.8mA/V

Amplification Factor (μ)Amplification Factor (μ)6.2—

Heater

Heater VoltageHeater Voltage12.6V

Heater CurrentHeater Current0.6A

Screen Grid (g2)

5Control Grid (g1)

6No Connection

7Heater

8Cathode and Beam Plates (g3)