19T8
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BrandGeneral Electric
ClassTriple-Diode Triode
Base9-Pin Miniature
Filament18.9V @ 0.15mA
Construction
Primary TypeHigh-Mu Triode, Triple Diode
EnvelopeT5-1/2 Glass
Base MaterialGlass
SectionsTriode and Three Diodes
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Cathode Current5 mA
H-C Voltage90 V
Audio Performance
Key Features
- Three high-perveance diodes
- Separate cathode for one diode
- Combined AM/FM detector and audio amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Triode Unit) | 100V | 1200 | - | 70 | 0.8mA |
| Class A Amplifier (Triode Unit) | 250V | 1000 | - | 70 | 1mA |
Application Notes
For ratio-detector circuits in FM, it is recommended that diodes number 2 and 3 be used. Except for heater rating, the 19T8 and the 6T8 are identical.
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