Tube-number record
4028A
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BrandRCA
ClassHigh-Mu Triode
BasePlanar / disc seal
Filament6.3 V @ 0.3 mA
Construction
Primary TypeTriode
EnvelopePencil
Base MaterialCeramic-Metal
SectionsSingle
Filament / Heater
Warm-up Time10s
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 1 Voltage-50 V
Cathode Current45 mA
H-C Voltage50 V
Audio Performance
Key Features
- Fast Warm-up Time
- Fast Heat Dissipation
- Ceramic-Metal construction
- Compact mobile and aircraft equipment
- High-Mu
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier Class C | 250 V | 22500 | — | 70 | 31 mA |
| RF Power Amplifier Class C | 300 V | 22500 | — | 70 | 35 mA |
| Plate Pulsed Oscillator | 1750 V | — | — | — | 2.5 mA |
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