Tube-number record
SR 45
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SR 45 is a tube type in the TubeDatabase archive (class: Voltage Reference Tube). Recorded specifications: construction Cold molybdenum cathode, base Glass, socket Subminiature, and maximum plate voltage 140 V. The archive does not yet hold a photographed example of this type.
ClassVoltage Reference Tube
BaseSubminiature
Construction
Primary TypeCold molybdenum cathode
EnvelopeSubminiature
Base MaterialGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage140 V
Cathode Current5 mA
Audio Performance
Key Features
- Cold molybdenum cathode
- Tritium pre-ionization
- Subminiature size
- Soldering connections
- Breakdown voltage not influenced by light
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Stabilizing | 105 V | — | — | — | 2.5 mA |
| Typical Operation (UB Supply) | 200 V | — | 15000 | — | 3.5 mA |
Application Notes
Breakdown voltage is independent of illumination, remains unchanged in complete darkness.
Datasheets
Datasheet: SR45.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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