Tube-number record
15A8
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15A8 is a tube type in the TubeDatabase archive (class: Triode Pentode). Recorded specifications: brand Tung-Sol, year 1955, construction Multi-section, socket Octal, maximum plate voltage 400 V, and maximum plate dissipation 7.5 W. The archive does not yet hold a photographed example of this type.
BrandTung-Sol
ClassTriode Pentode
BaseOctal
Filament15 V @ 600 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Sections2
Filament / Heater
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation7.5 W
Grid 1 Voltage400 V
Cathode Current40 mA
H-C Voltage200 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- Controlled Heater Warm-up
- Beam Pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Class A1 | 90 V | 2600 | 7700 | 20 | 9 mA |
| Triode Class A1 | 250 V | 2600 | 7700 | 20 | 9 mA |
| Pentode | 110 V | 7300 | 13000 | — | 45 mA |
| Pentode Triode-Connected | 225 V | 3800 | 1600 | 6 | 25 mA |
Application Notes
Designed for use as a combined vertical deflection oscillator and amplifier in television receivers.
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