7189/7189A
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BrandSylvania
ClassBeam Power Pentode
BaseE9-1 Miniature Button 9-Pin
Filament6.3V @ 760mA
Construction
Primary TypePentode
EnvelopeMiniature Button 9-Pin
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesMaximum Voltage Range: 5.7-6.9 Volts
Absolute Maximum Ratings
Plate Voltage440 V
Plate Dissipation13.2 W
Grid 2 Voltage400 V
Cathode Current72 mA
H-C Voltage100 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- High power output
- Relative low distortion
- Ultra-linear operation capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Pentode Single Tube | 250V | 11300 | 40000 | 19.5 | 48mA |
| Class AB1 Push-pull Pentode | 400V | - | - | - | 15mA |
| Class AB1 Push-pull Ultra-linear | 375V | - | - | - | 70mA |
Application Notes
The Types 7189 and 7189A are beam power pentode audio amplifiers designed for service in the output stage of high quality audio amplifiers.
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