5BT8
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BrandSYLVANIA
ClassDUODIODE - SHARP CUTOFF PENTODE
BaseMiniature Button 9-Pin
Filament4.7V @ 600mA
Construction
Primary TypeDUODIODE - SHARP CUTOFF PENTODE
EnvelopeT-6 1/2
Base MaterialMiniature Button 9-Pin
SectionsPentode, Double Diode
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesControlled heater warm-up time for series string operation.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2 W
Grid 2 Voltage300 V
H-C Voltage200 V
Audio Performance
Key Features
- Controlled heater warm-up time
- Sharp cutoff pentode
- Double diode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 200V | 6200 | 300000 | - | 9.5mA |
| Diode Section (Each) | - | - | - | - | 8mA |
Application Notes
The pentode section may be used as an IF amplifier, video amplifier, AGC amplifier or reactance tube. Designed for series string operation.
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