3B4
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BrandHytron
ClassMiniature Instant-Heating Beam Pentode
Baseminiature button 7-pin
Construction
Primary TypeBeam Pentode
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) | 90V | 1700 | - | - | 15mA |
| Class C Oscillation and Amplifier 100 mc (High) | 150V | 1700 | - | - | 25mA |
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.
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