Tube-number record
931-A
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BrandRCA
ClassMultiplier Phototube
BaseMagnal
Construction
Primary TypeMulti-section
EnvelopeT9
Base MaterialNon-hygroscopic
Sections9
Filament / Heater
Absolute Maximum Ratings
Plate Voltage1250 V
Grid 2 Voltage250 V
Cathode Current1 mA
Audio Performance
Key Features
- 9-Stage Multiplier
- S-4 Response
- Electrostatic Dynode System
- Small-Shell Submagnal Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| 100 volts per dynode stage | 1000 V | — | — | 1000000 | 1 mA |
| 75 volts per dynode stage | 750 V | — | — | 150000 | — |
Application Notes
Operating stability is dependent on the magnitude of the anode current and its duration. Operation below 1000 volts is recommended for maximum signal-to-noise ratio.
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