12AT7
5 Tubes in archive
BrandBrimar
ClassTwin Triode
BaseB9A
Filament12.6V @ 150mA
Construction
Primary TypeTwin Triode
EnvelopeT6 1/2
Base MaterialGlass
SectionsTwo
Filament / Heater
Heater NotesCenter-tap enables use on 12.6V or 6.3V supplies.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 1 Voltage-50 V
Cathode Current20 mA
H-C Voltage250 V
Audio Performance
Key Features
- Indirectly heated
- Separate triode units
- Heater center tap
- Low noise factor
- High conversion gain
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100V | 4000 | 13500 | 54 | 3.7mA |
| Class A1 Amplifier | 180V | 6600 | 9400 | 62 | 11mA |
| Class A1 Amplifier | 250V | 5500 | 10000 | 55 | 10mA |
Application Notes
Designed for use as a frequency changer, oscillator, grounded grid amplifier, and frequency multiplier for ultra-short waves. Useful up to at least 450 Mc/s.
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