Tube-number record
5BT8
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5BT8 is a tube type in the TubeDatabase archive (class: DUODIODE - SHARP CUTOFF PENTODE). Recorded specifications: brand SYLVANIA, construction Pentode, base Miniature Button 9-Pin, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
BrandSYLVANIA
ClassDUODIODE - SHARP CUTOFF PENTODE
BaseNoval (B9A)
Filament4.7 V @ 600 mA
Construction
Primary TypePentode
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 | 200 V | 6200 | 300000 | — | 9.5 mA |
| Diode Section (Each) | — | — | — | — | 8 mA |
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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