Tube-number record
227
0 archive entries
227 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: construction Triode, socket 5-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
ClassTriode
Base5-pin
Filament2.5 V @ 1.75 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 250 V | 975 | 9250 | 9 | 5.2 mA |
| Class A1 Amplifier | 180 V | 1000 | 9000 | 9 | 5 mA |
Application Notes
The 227 is a detector, amplifier, and oscillator tube. It is designed for use in radio receivers where a 2.5-volt AC supply is available.
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