Tube-number record
1P22
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BrandRCA
ClassMultiplier Phototube
BaseMagnal
Construction
Primary TypeMulti-section
EnvelopeT-9
Base MaterialNon-Hygroscopic
Sections9-stage
Filament / Heater
Absolute Maximum Ratings
Plate Voltage1250 V
Grid 2 Voltage250 V
Cathode Current1 mA
Audio Performance
Key Features
- 9-Stage Multiplier
- Side-on Type
- Opaque Cathode
- High Sensitivity to Green-and-Blue Rich Light
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| 100 Volts per Stage | 1000 V | — | — | 200000 | 0.00025 mA |
| 75 Volts per Stage | 750 V | — | — | 30000 | — |
Application Notes
Especially useful in colorimetric and spectroscopic applications. Dark current due to thermionic emission may be reduced by the use of refrigerants.
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