Tube-number record
270A
0 archive entries
270A is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Western Electric, construction Triode, socket Special / none, maximum plate voltage 3000 V, and maximum plate dissipation 350 W. The archive does not yet hold a photographed example of this type.
BrandWestern Electric
ClassTriode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier (Point 1) | 2500 V | 5700 | 2800 | 16 | 120 mA |
| Class A Audio Amplifier (Point 2) | 2000 V | — | — | — | 150 mA |
| Grid Bias Modulator | 3000 V | — | — | — |
Application Notes
The tube should preferably be mounted in an upright or vertical position. Free circulation of air must be provided to insure adequate cooling. Emission may be restored by operating filament 30% above normal voltage for 10 minutes with plate/grid off.
Datasheets
Datasheet: 270A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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