Tube-number record
18A5
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BrandGeneral Electric
ClassBeam Pentode
BaseOctal
Filament18.5 V @ 0.3 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT-9
Base MaterialIntermediate Shell Octal 6-Pin
Sections1
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesControlled heater warm-up characteristic for 300-milliampere series-string receivers
Absolute Maximum Ratings
Plate Voltage350 V
Plate Dissipation9 W
Grid 2 Voltage160 V
Grid 1 Voltage-250 V
Cathode Current90 mA
H-C Voltage200 V
Audio Performance
Key Features
- Controlled heater warm-up
- Designed for horizontal-deflection amplifier service
- Small size
- Low power requirements
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 60 V | — | — | — | 165 mA |
| Pentode | 200 V | 4800 | 27000 | 4.6 | 40 mA |
Application Notes
Specifically designed for horizontal-deflection amplifier service in compact series-string television receivers with low d-c supply voltages.
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