5B8
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BrandSylvania
ClassMiniature sharp cutoff pentode and medium mu triode
BaseSmall Button 9-Pin
Filament4.7V @ 600mA
Construction
Primary TypePentode-Triode
EnvelopeT6-1/2
Base MaterialSmall Button 9-Pin (E9-1)
SectionsDual
Filament / Heater
Warm-up Time11s
Heater NotesControlled heater warm-up time for series heater string service.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 2 Voltage300 V
H-C Voltage200 V
Audio Performance
Key Features
- Miniature construction
- 600 mA heater current
- 11-second controlled heater warm-up
- Internal Shield
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Triode Section) | 200V | 3300 | 5750 | 19 | 13mA |
| Class A Amplifier (Pentode Section) | 200V | 6200 | 300000 | - | 9.5mA |
Application Notes
The triode section may be used as a low frequency oscillator, sync separator or sync clipper. The pentode section may be used as an IF amplifier, video amplifier or AGC amplifier.
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