Tube-number record
V99 / X99
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BrandRCA
ClassGeneral Purpose Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeT-8 (V99) / T-9 (X99)
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage90 V
Grid 1 Voltage-10.5 V
Audio Performance
Key Features
- Dry-cell operation
- Low power consumption
- Three-electrode general-purpose
- Applicable to portable receivers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Amplifier | 90 V | 425 | 15500 | 6.6 | 2.5 mA |
| Grid-Bias Detector | 90 V | — | — | — | 0.2 mA |
| Grid-Leak Detector | 45 V | — | — | — | — |
Application Notes
As detectors, 99s may be operated either with grid leak and condenser or with grid bias. Recommended grid-circuit return should be connected to the positive filament terminal for grid-leak detection.
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