6BH11

Compound (multi-section) — Duodekal

RCA

Known Equivalents & Substitutes

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

Electrical Specifications

Section 1 — Triode (each unit)

Absolute Maximum

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

Anode Dissipation (max)Plate Dissipation (max)2.5W

Max Grid ResistorGrid Resistor (max)2.2MΩ

Typical Operating

Anode Voltage (typical)Plate Voltage125V

Grid 1 Bias VoltageGrid No.1 Voltage-1V

Anode CurrentPlate Current13.5mA

Anode ResistancePlate Resistance (approx.)5,400Ω

TransconductanceTransconductance

Section 2 — Pentode

Absolute Maximum

Anode Voltage (max)Plate Voltage (max, Class A1)300V

Anode Dissipation (max)Plate Dissipation (max)3W

Screen Voltage (max)Screen Voltage (max)300V

Max Grid ResistorGrid Resistor (max)2.2MΩ

Typical Operating

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.8A

Notes

The pentode section is rated for two distinct services: as a horizontal-deflection oscillator (Va_max=350V, Vg2_max=330V, Ik_peak=300mA, Pa_max=2.5W) and as a Class A1 amplifier (Va_max=300V, Vg2_max=300V, Pa_max=3W).
Pentode Grid No.2 max input: 0.6W for Vg2 up to 150V; higher voltages require consulting the screen input rating curve.
Pin 11 serves as both Pentode Cathode and Pentode Grid No.3 (suppressor connected to cathode internally), with internal shield.
Heater-to-cathode voltage: ±200V peak, 100V average maximum.
The twin triode sections are identical medium-mu units (μ=46, ra≈5.4kΩ). Both sections have identical characteristics.

Pin Layout — Duodekal

1Heater

2

References