Tube-number record
5640
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BrandSylvania
ClassBeam Power Output Tube
BaseSubminiature
Filament6.3 V @ 450 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeGlass Subminiature
SectionsSingle
Filament / Heater
Heater NotesAC or DC heater voltage
Absolute Maximum Ratings
Plate Voltage159 V
Plate Dissipation3.5 W
Grid 2 Voltage140 V
H-C Voltage80 V
Audio Performance
Typical THD10%
Power Output1.25 W
Key Features
- Subminiature
- Beam power output
- Compact light-weight equipment
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 100 V | 5000 | 15000 | — | 31 mA |
Application Notes
Maximum grid circuit resistance should not exceed 0.10 megohm for fixed bias operation and 0.50 megohm for self bias operation. Avoid bending leads closer than 0.060" from glass. Arrow indicates position of plate lead.
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