Tube-number record
8BA8A
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BrandTung-Sol
ClassTriode Pentode
BaseNoval (B9A)
Filament8.4 V @ 450 mA
Construction
Primary TypeMulti-section
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) | 200 V | 2700 | 6700 | 18 | 8 mA |
| Pentode Section (Class A1 Amplifier) | 200 V | 6000 | 400000 | — | 13 mA |
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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