3BC5
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BrandSylvania
ClassPentode
BaseMiniature Button 7-Pin
Filament3.15V @ 600mA
Construction
Primary TypePentode
EnvelopeT5 1/2
SectionsSingle
Filament / Heater
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
- Miniature high transconductance sharp cutoff pentode
- Designed for IF amplifiers
- Controlled heater warm-up time
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier - Pentode Connected | 100V | 4900 | 600000 | - | 4.7mA |
| Class A Amplifier - Pentode Connected | 125V | 6100 | 500000 | - | 8mA |
| Class A Amplifier - Pentode Connected | 250V | 5700 | 800000 | - | 7.5mA |
| Triode Connected | 250V | 4400 | 9000 | 40 | 6mA |
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