Tube-number record
268A
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BrandWestern Electric
ClassTriode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage750 V
Plate Dissipation25 W
Grid 1 Voltage-340 V
Cathode Current60 mA
Audio Performance
Typical THD5%
Power Output4 W
Key Features
- Filamentary air-cooled triode
- Thoriated tungsten filament
- High frequency capability to 60 MHz
- Plate terminal on top bulb cap
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier (Point 1) | 750 V | 800 | 6250 | 5 | 25 mA |
| Class A Audio Amplifier (Point 2) | 500 V | — | — | — | 40 mA |
| Class B Audio (Balanced 2-Tube) | 750 V | — | — | — |
Application Notes
Recommended for audio-frequency power amplifier, modulator, or radio-frequency oscillator. Provide free air circulation for cooling.
Datasheets
Datasheet: 268A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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