Tube-number record
4521
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BrandRCA
ClassPhotomultiplier Tube
BaseDiheptal
Construction
Primary TypeMulti-section
EnvelopeAluminum-Oxide Window
Base MaterialSmall-Shell Diheptal
Sections10-stage
Filament / Heater
Absolute Maximum Ratings
Plate Voltage2000 V
Grid 2 Voltage250 V
Grid 1 Voltage600 V
Cathode Current0.5 mA
Audio Performance
Key Features
- 10-Stage
- Venetian-Blind Dynodes
- Bialkali Photocathode
- Aluminum-Oxide Window
- Plano-Plano Window Shape
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Photometric Applications | 1500 V | — | — | 2200000 | 0.009 mA |
Application Notes
Electrostatic and magnetic shielding usually required. Shield must be at cathode potential. Operating voltage is dangerous; avoid contact.
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