Tube-number record
2B5
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2B5 is a tube type in the TubeDatabase archive (class: Double Triode). Recorded specifications: brand Sylvania, year 1951, construction Dual triode, base Glass, socket Subminiature, and maximum plate dissipation 0.55 W. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassDouble Triode
BaseSubminiature
Construction
Primary TypeDual triode
EnvelopeT2x3
Base MaterialGlass
Sections2
Filament / Heater
MaterialCoated
Absolute Maximum Ratings
Plate Dissipation0.55 W
Grid 1 Voltage-20 V
Cathode Current5 mA
Audio Performance
Key Features
- Subminiature
- Operation up to 150 megacycles
- Voltage amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Each section, parallel filament operation | 90 V | 1150 | 18700 | 21.5 | 2.6 mA |
Application Notes
For series operation of filament a shunting resistor must be connected between pins 4 and 2 (or 7). The resistor value should be such that the voltage across the shunted section is equal to the voltage between pins 5 and 2.
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