12DQ6

Beam Tetrode — Octal

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Known Equivalents & Substitutes

12DQ6A12DQ6B

Similar Tubes (Not Drop-In Compatible)

12CU6

Brans lists as equivalent — similar beam power tube for horizontal deflection, same heater

17DQ6

Same tube with 16.8V heater — different series-string voltage

6DQ6

Electrically identical but 6.3V heater — not interchangeable in series-string heater circuits

6GW6

Brans lists in same group — similar beam power tube but 6.3V heater

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Max Plate Voltage550V

Peak Anode Voltage (max)Max Peak Positive Plate Voltage6,000V

Screen Voltage (max)Max Screen Voltage175V

Anode Dissipation (max)Max Plate Dissipation15W

Screen Dissipation (max)

Notes

GE Essential Characteristics lists two variants: 12DQ6 and 12DQ6-A with slightly different gm (5500 vs 6600 umhos).
Designed for horizontal deflection amplifier service — peak anode voltage can reach 6000V during flyback.
Max plate dissipation 15W, max plate voltage 550V (DC), max screen voltage 175V.
12.6V/0.6A heater for series-string operation in television receivers.
Brans Vademecum cross-lists extensively with 6BQ6, 6CU6, 6DQ6, 6EM5, and their 12V/17V/25V heater variants.

Pin Layout — Octal

1No Connection

2Heater

3Plate

Socket-Compatible Tubes ⚠ Not electrically compatible

12W6GT 25L6GT 350B 6550 6CD6G 6F6 6F6S 6K6 6M6G 6N3C 6V6 6W6 6Y6 7581 KT77

Max Screen Dissipation

2.5W

Cathode Current (max)Max Cathode Current120mA

Typical Operating

Anode Voltage (typical)Plate Voltage250V

Grid 1 Bias VoltageGrid Voltage-22.5V

Screen VoltageScreen Voltage150V

Anode CurrentPlate Current75mA

Screen CurrentScreen Current2.4mA

Anode ResistancePlate Resistance20,000Ω

TransconductanceTransconductance6mA/V

Capacitances

Grid-to-Plate CapacitanceGrid-Anode Capacitance0.55pF

Grid-to-Cathode CapacitanceCathode-Grid Capacitance15pF

Output CapacitanceAnode-Cathode Capacitance7pF

Heater

Heater VoltageHeater Voltage12.6V

Heater CurrentHeater Current0.6A

Screen Grid (g2)

5Control Grid (g1)

6No Connection

7Heater

8Cathode

KT90