UL 84
0 Tubes in archive
BrandPhilips
ClassOutput Pentode
BaseNoval
Filament45V @ 100mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating, series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation12 W
Grid 2 Voltage200 V
Cathode Current100 mA
H-C Voltage200 V
Audio Performance
Typical THD10%
Power Output5.6 W
Key Features
- Indirectly heated
- Series heater supply
- Noval base
- High transconductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 100V | 9000 | 23000 | 8 | 43mA |
| Class A | 170V | 11000 | 26000 | 8 | 70mA |
| Class B (Two Tubes) | 170V | - | - | - | 115mA |
Application Notes
Commonly used in transformerless (series-string) audio output stages and single-ended or push-pull configurations.
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