Tube-number record
4GS8
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BrandTung-Sol
ClassDual Pentode
BaseNoval (B9A)
Filament4.2 V @ 450 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
Sections2
Filament / Heater
MaterialCoated Unipotential Cathode
Warm-up Time11s
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.1 W
Grid 2 Voltage150 V
Grid 1 Voltage-50 V
Cathode Current12 mA
H-C Voltage200 V
Audio Performance
Key Features
- Separate Plate
- Separate #3 Grid
- Miniature construction
- Sync separator-clipper
- AGC tube
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Both sections operating | 100 V | — | — | — | 2 mA |
| Each section separately | 100 V | 270 | — | — | 2 mA |
Application Notes
Primarily intended for service as a combined sync separator-clipper and AGC tube in television receivers.
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