Tube-number record
7728
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BrandCBS
ClassMedium-mu twin triode
BaseNoval (B9A)
Filament12.6 V @ 150 mA
Construction
Primary TypeDual triode
EnvelopeT-6 1/2
Base MaterialGold plated pins
Sections2
Filament / Heater
Heater NotesContinuous-wound coil heater; Series or Parallel operation
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation2.8 W
H-C Voltage200 V
Audio Performance
Key Features
- Continuous-wound coil heater
- Gold plated base pins
- Interface impedance resistance
- 48 hour burn-in
- Early life assurance tested
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Condition 1) | 100 V | 4000 | 15000 | 60 | 3.7 mA |
| Class A Amplifier (Condition 2) | 250 V | 5500 | 10900 | 60 | 10 mA |
Application Notes
Especially designed for use in measurement test equipment, instrumentation, and applications where extreme reliability and stable characteristics are required.
Datasheets
Datasheet: 7728.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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