Tube-number record
ILB4
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BrandTUNG-SOL
ClassPENTODE POWER AMPLIFIER
BaseLoctal
Construction
Primary TypePentode
EnvelopeGlass Bulb T-3
Base MaterialLocking-In 8 Pin Base
Sections1
Filament / Heater
MaterialCoated
Absolute Maximum Ratings
Plate Voltage110 V
Grid 2 Voltage110 V
Cathode Current6 mA
Audio Performance
Typical THD10%
Power Output0.2 W
Key Features
- Low voltage
- Low current drain
- Battery type power pentode
- Designed for 90V B battery
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier (Mode 1) | 45 V | 650 | 300000 | — | 1.6 mA |
| Class A1 Amplifier (Mode 2) | 62.5 V | 875 | 200000 | — | 4.6 mA |
| Class A1 Amplifier (Mode 3) | 67.5 V | 875 | 200000 | — |
Application Notes
Designed for service with 90 volts of B battery and a single dry cell A battery.
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