ECL 84
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BrandPHILIPS
ClassTriode-Pentode
BaseNOVAL
Filament6.3V @ 720mA
Construction
Primary TypeTriode-Pentode
EnvelopeGlass
Base MaterialNOVAL
SectionsTriode, Pentode
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; Parallel 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 keyed A.G.C.
- Sync separation
- Sync amplification
- Noise suppression
- Pentode as video output tube
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode section | 200V | 4000 | - | 65 | 3mA |
| Pentode section | 170V | 11000 | 100000 | 36 | 18mA |
| Pentode section | 200V | 10400 | 130000 | 36 | 18mA |
| Pentode section | 220V | 10000 | 150000 | 36 | 18mA |
Application Notes
Pentode intended for video output; triode for sync and noise suppression circuits.
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