UM84
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BrandPhilips
ClassIndicator Tube
BaseNoval
Filament12.6V @ 100mA
Construction
Primary TypeIndicator tube with amplifying triode
EnvelopeGlass
SectionsTriode and indicator
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; Series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation0.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current3 mA
H-C Voltage250 V
Audio Performance
Key Features
- Amplifying triode included
- Tuning indicator
- Modulation control
- Series heater supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Tuning Indicator (max shadow) | 170V | - | - | - | 0.3mA |
| Tuning Indicator (min shadow) | 170V | - | - | - | 0.04mA |
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