Tube-number record
9821B
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9821B is a tube type in the TubeDatabase archive (class: Photomultiplier Tube). Recorded specifications: brand EMI, construction Other / special, socket Special / none, maximum plate voltage 3000 V, and maximum plate dissipation 0.1 W. The archive does not yet hold a photographed example of this type.
BrandEMI
ClassPhotomultiplier Tube
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeBorosilicate
Sections12-stage dynode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation0.1 W
Grid 2 Voltage550 V
Grid 1 Voltage-50 V
Cathode Current0.0003 mA
Audio Performance
Key Features
- Linear focused dynodes
- BeO(Cs) secondary emitter
- Individually calibrated
- Low dark current
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Rated Sensitivity | 2050 V | — | — | — | 0.001 mA |
Application Notes
Focus (F) may be connected to D1 for normal operation. Tube may be gated off by application of -50 volts w.r.t. cathode. For optimum stability under dc conditions, the mean anode current should not exceed 1.0 uA.
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