4BS8
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BrandTUNG-SOL
ClassTwin Triode
BaseNoval
Filament4.5V @ 600mA
Construction
Primary TypeTwin Triode
EnvelopeGlass
Sections2
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation2 W
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Low noise VHF amplifier
- Cascode operation
- High gain
- High cascode transconductance
- Controlled heater warm-up cycle
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A, Amplifier (Each Unit) | 150V | 7200 | 5000 | 36 | 10mA |
| Cascode Operation | 250V | 10000 | - | - | 16mA |
Application Notes
Designed for use as a low noise VHF amplifier in cascode operation. Section 2 (pins 1, 2, and 3) is intended as the input section. Except for heater ratings, it is identical to type 6BS8.
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