270A
0 Tubes in archive
BrandWestern Electric
ClassTriode
BaseCustom vertical mounting
Construction
Primary TypeFilamentary air-cooled triode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation350 W
Cathode Current375 mA
Audio Performance
Typical THD5%
Power Output90 W
Key Features
- Air-cooled
- Thoriated tungsten filament
- May be used as modulator or oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier (Point 1) | 2500V | 5700 | 2800 | 16 | 120mA |
| Class A Audio Amplifier (Point 2) | 2000V | - | - | - | 150mA |
| Grid Bias Modulator | 3000V | - | - | - | 75mA |
| Class C Radio-Frequency Oscillator | 3000V | - | - | - | 350mA |
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.
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