Tube-number record
19V8
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19V8 is a tube type in the TubeDatabase archive (class: Triple-Diode Triode). Recorded specifications: brand Tung-Sol, year 1950, construction Multi-section, base Button Base, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.
BrandTung-Sol
ClassTriple-Diode Triode
BaseNoval (B9A)
Filament18.9 V @ 150 mA
Construction
Primary TypeMulti-section
EnvelopeGlass Bulb
Base MaterialButton Base
SectionsTwo high perveance diodes, one medium perveance diode, and one high-mu triode
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
H-C Voltage200 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- High perveance diodes
- Independent cathode for diode #4
- Triple diode triode structure for AM/FM
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100 V | 1300 | 54000 | 70 | 0.8 mA |
| Class A1 Amplifier | 250 V | 1200 | 58000 | 70 | 1 mA |
Application Notes
The 19V8 is designed for use in AM/FM receivers with minimum switching. One high perveance diode has an independent cathode for balanced low impedance detector circuits.
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