Tube-number record
5CL8
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BrandTung-Sol
ClassTriode Tetrode
BaseNoval (B9A)
Filament4.7 V @ 0.6 mA
Construction
Primary TypeOther / special
EnvelopeGlass
SectionsTriode Tetrode
Filament / Heater
Heater NotesControlled warm-up time
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.8 W
Grid 2 Voltage400 V
H-C Voltage200 V
Audio Performance
Key Features
- Controlled heater warm-up characteristics
- VHF Oscillator-Mixer design
- Unipotential Cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Class A Amplifier | 125 V | 8000 | 5000 | 40 | 15 mA |
| Tetrode Class A Amplifier | 125 V | 5800 | 100000 | — | 12 mA |
Application Notes
Designed for use as a VHF oscillator-mixer; heater characteristics controlled to minimize surges when used in series strings.
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