Tube-number record
11LQ8
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BrandRCA
ClassMedium-Mu Triode, Sharp-Cutoff Pentode
BaseNoval (B9A)
Filament10.9 V @ 0.45 mA
Construction
Primary TypeMulti-section
Envelope6-1/2
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesWarmup time: 11 seconds
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation5 W
Grid 2 Voltage300 V
H-C Voltage200 V
Audio Performance
Key Features
- Frame-grid construction
- Low-voltage power supply compatibility
- Sync-separator service
- Video output service
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 125 V | 10400 | 4400 | 46 | 15 mA |
| Pentode Section (Condition 1) | 125 V | 21000 | 55000 | — | 19 mA |
| Pentode Section (Condition 2) | 200 V | 23000 | 75000 | — | 22 mA |
Application Notes
Triode unit useful in sync-separator, sound-IF circuits, and as a general-purpose voltage-amplifier tube. Pentode unit especially suited for video output service.
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