Tube-number record
XCL 84 / 8DX8
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BrandIBRAPE / MINIWATT
ClassTriode-Pentode
Filament7.8 V @ 0.6 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirect heating for AC or DC series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation4 W
Grid 2 Voltage250 V
Cathode Current40 mA
H-C Voltage200 V
Audio Performance
Key Features
- Separate cathodes
- Triode for AGC keyed and sync separation
- Pentode for video output
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode typical operation | 200 V | 4000 | — | 65 | 3 mA |
| Pentode typical operation set 1 | 170 V | 11000 | 100000 | 36 | 18 mA |
| Pentode typical operation set 2 | 200 V | 10400 | 180000 | 36 | 18 mA |
Application Notes
Pentode designed specifically as video output valve; triode for keyed AGC, sync separation, and noise suppression.
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