408A
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BrandSylvania
ClassRF Pentode
BaseMiniature Button 7-pin
Filament20V @ 50mA
Construction
Primary TypePentode
EnvelopeMiniature
Base MaterialMiniature Button
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage180 V
Plate Dissipation1.7 W
Grid 2 Voltage180 V
Cathode Current18 mA
H-C Voltage75 V
Audio Performance
Key Features
- Sharp-cutoff rf pentode
- Reliable service
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 120V | 5000 | 340000 | - | 7mA |
Application Notes
Designed for reliable service under conditions encountered in communication applications.
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