Tube-number record
5640
0 archive entries
5640 is a tube type in the TubeDatabase archive (class: Beam Power Output Tube). Recorded specifications: brand Sylvania, year 1948, construction Beam tetrode / beam power, socket Subminiature, maximum plate voltage 159 V, and maximum plate dissipation 3.5 W. The archive does not yet hold a photographed example of this type.
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
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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