Tube-number record
3B4
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3B4 is a tube type in the TubeDatabase archive (class: Miniature Instant-Heating Beam Pentode). Recorded specifications: brand Hytron, construction Beam tetrode / beam power, socket Miniature 7-pin (B7G), maximum plate voltage 150 V, and maximum plate dissipation 3 W. The archive does not yet hold a photographed example of this type.
BrandHytron
ClassMiniature Instant-Heating Beam Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT-5 1/2
SectionsSingle
Filament / Heater
Materialoxide coated
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation3 W
Grid 2 Voltage135 V
Grid 1 Voltage-75 V
Cathode Current25 mA
Audio Performance
Power Output1.25 W
Key Features
- Instant-Heating
- VHF portable-mobile equipment
- Class C oscillator
- Frequency multiplier
- R-F amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Oscillation and Amplifier 100 mc (Low) | 90 V | 1700 | — | — | 15 mA |
| Class C Oscillation and Amplifier 100 mc (High) | 150 V | 1700 | — | — | 25 mA |
Application Notes
Filament is essentially instantaneous in heating. May be used at full ratings to 100 megacycles. When series connected, the low section of the filament should be shunted by a resistor to by-pass cathode current. In VHF circuits, it may be desirable to by-pass filament center taps to provide lowest effective cathode inductance.
Datasheets
Datasheet: 3B4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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