7489
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BrandBrimar
ClassLow-mu double triode
BaseB9A
Filament12.6V @ 0.15mA
Construction
Primary TypeDouble Triode
EnvelopeT6-1/2
Sections2
Filament / Heater
Heater NotesPin 9 is heater centre tap for series or parallel operation.
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3 W
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Low catastrophic failure rate
- Special alloy cathode sleeve to inhibit interface resistance
- Pure tungsten heater
- Rugged electrode construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Each Section | 250V | 2200 | 7700 | 17 | 10.5mA |
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