Tube-number record
220
0 archive entries
220 is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: construction Triode, socket 4-pin, and maximum plate voltage 135 V. The archive does not yet hold a photographed example of this type.
ClassPower Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage135 V
Grid 1 Voltage-22.5 V
Audio Performance
Key Features
- Filamentary power amplifier triode
- Dry-cell operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 135 V | 525 | 6300 | 3.3 | 6.5 mA |
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