348A
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BrandWestern Electric
ClassSuppressor-grid pentode
Base7-pin octal
Filament6.3V @ 500mA
Construction
Primary Typesuppressor-grid pentode
EnvelopeBulb
Base MaterialSmall shell
Sectionssingle
Filament / Heater
Heater NotesIndirectly heated cathode; AC or DC operation.
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage180 V
Grid 1 Voltage-5.5 V
Audio Performance
Key Features
- Low tube noise
- Indirectly heated cathode
- Suppressor-grid pentode
- Audio-frequency voltage amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Conditions | 135V | - | - | - | 5.5mA |
| Recommended Conditions | 180V | - | - | - | 5.5mA |
| Maximum Conditions | 250V | - | - | - | 5.6mA |
| Maximum Conditions | 250V | - | - | - | 6mA |
Application Notes
The heater element is designed to operate on a voltage basis and it should be operated as near the rated voltage as practicable. Operation at a higher voltage will definitely reduce the life of the tube.
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