7729
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BrandCBS
ClassHigh-mu twin triode
BaseMiniature 9-pin (E9-1)
Filament6.3V @ 300mA
Construction
Primary TypeTriode
EnvelopeT-6 1/2
Base MaterialGold plated base pins
SectionsTwin
Filament / Heater
Heater NotesContinuous-wound coil heater
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation1.1 W
Grid 1 Voltage-55 V
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- High reliability
- Stable characteristics
- Long life
- Continuous-wound coil heater
- Gold plated base pins
- Low noise and microphonism
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 100V | 1250 | 80000 | 100 | 0.5mA |
| Class A Amplifier | 250V | 1600 | 62500 | 100 | 1.2mA |
Application Notes
Designed and tested for use in measurement test equipment, instrumentation, and applications requiring extreme reliability.
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