Tube-number record
XCL 82/8B8
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BrandIBRAPE / MINIWATT
ClassTriode-Pentode
BaseNoval (B9A)
Filament8.2 V @ 0.3 mA
Construction
EnvelopeGlass
SectionsTriode, Pentode
Filament / Heater
Warm-up Time11s
Heater NotesIndirect heating; series supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation7 W
Grid 2 Voltage300 V
Cathode Current50 mA
H-C Voltage200 V
Audio Performance
Typical THD10%
Power Output3.5 W
Key Features
- Triode used as vertical oscillator or AF amplifier
- Pentode used as audio output or vertical output
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Class A | 200 V | 6400 | 20000 | 9.5 | 35 mA |
| Pentode Class A (Low Voltage) | 100 V | 6800 | 15000 | 10 | 26 mA |
| Triode | 100 V | 2200 | — | 70 | 3.5 mA |
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