Tube-number record
256A
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BrandWestern Electric
ClassGrid-controlled Rectifier (Thyratron)
Base5-pin
Filament2.3 V @ 1700 mA
Construction
Primary TypeTriode
Rectifier TypeArgon-filled
EnvelopeGlass
SectionsSingle
Filament / Heater
Warm-up Time60s
Heater NotesVoltage should be maintained within 5% of rated value.
Absolute Maximum Ratings
Plate Voltage325 V
Grid 1 Voltage-10 V
Cathode Current75 mA
H-C Voltage12 V
Audio Performance
Key Features
- Indirectly heated cathode
- Argon filled
- Visible discharge during conduction
- Trigger-action capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Conducting | 15 V | — | — | — | — |
Application Notes
Intended for use as a relay or trigger-action device. Other uses: controlled-frequency oscillator (square wave), voltmeter, volume level indicator, sweep-voltage source, or variable-voltage rectifier. Protective resistance must be included in the anode circuit.
Datasheets
Datasheet: 256A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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