8BA8A
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BrandTung-Sol
ClassTriode Pentode
Base9-Pin Miniature
Filament8.4V @ 450mA
Construction
Primary TypeTriode-Pentode
EnvelopeGlass
Base MaterialGlass
Sections2
Filament / Heater
Warm-up Time11s
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3.25 W
Grid 2 Voltage300 V
Grid 1 Voltage-50 V
H-C Voltage200 V
Audio Performance
Key Features
- Controlled plate knee characteristic
- Controlled heater warm-up
- Minimized heater voltage surges
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section (Class A1 Amplifier) | 200V | 2700 | 6700 | 18 | 8mA |
| Pentode Section (Class A1 Amplifier) | 200V | 6000 | 400000 | - | 13mA |
Application Notes
Heater warm-up time is defined as the time required for voltage to reach 80% of rated value after applying 4 times rated voltage in series with a resistor 3 times nominal operating resistance.
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