Tube-number record
SR 53 (OG 3)
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ClassVoltage Reference Tube
BaseMiniature 7-pin (B7G)
Construction
Primary TypeOther / special
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage115 V
Cathode Current10 mA
Audio Performance
Key Features
- Molybdenum cathode
- Extremely long life
- High stability
- Freedom of flickering
- Breakdown voltage not influenced by light
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Stabilizing | 85 V | — | — | — | 5.5 mA |
Application Notes
The breakdown voltage remains unchanged even in total darkness. Complete information on stabilizing circuits in information 5.07. Mounting in any position.
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