Tube-number record
240
0 archive entries
240 is a tube type in the TubeDatabase archive (class: High-Mu Triode). Recorded specifications: construction Triode, socket 4-pin, and maximum plate voltage 180 V. The archive does not yet hold a photographed example of this type.
ClassHigh-Mu Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeST-12
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage180 V
Audio Performance
Key Features
- High amplification factor
- Designed for resistance-coupled audio frequency amplifiers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 180 V | 200 | 150000 | 30 | 0.2 mA |
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