6BD11

Name: 6BD11
Brand: RCA

Compound (multi-section) — Duodekal — RCA

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

6AF11

Electrical Specifications

Section 1 — Triode No.1 (High-Mu)

Absolute Maximum

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

Anode Dissipation (max)Plate Dissipation (max)1.5W

Max Grid ResistorGrid Resistor (fixed bias, max)0.5MΩ

Typical Operating

Anode Voltage (typical)Plate Supply Voltage200

Notes

The 6AF11 is pin-identical (12DP basing) with the same triode characteristics, but has a higher-rated pentode section (Pa_max=5W vs 4W, Ps_max=1.25W vs 1.1W for Vg2≤165V) and slightly lower triode No.1 Pa_max (1.1W vs 1.5W). The 6AF11 can substitute for the 6BD11 in all standard applications.
The dual triode has a high-mu (μ=68) unit (Triode No.1) and a medium-mu (μ=41) unit (Triode No.2) in a single envelope — not two identical triodes.
Pin 7 serves as Cathode of Triode Unit No.2 and Internal Shield; Pin 9 serves as Pentode Cathode, Pentode Grid No.3, and Internal Shield — both are shared internal connections.
Pentode Grid-No.2 max input: 1.1W for Vg2 up to 165V; higher voltages require consulting the Grid-No.2 Input Rating Chart.
Heater-to-cathode voltage: max 200V peak (heater negative); max 200V peak / 100V DC (heater positive).

Pin Layout — Duodekal

1Heater

2

References