Tube-number record
925
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BrandRCA
ClassPhototube
BaseOctal
Construction
Primary TypeHigh-vacuum phototube
EnvelopeT-9
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Cathode Current0.005 mA
Audio Performance
Key Features
- Side-on type
- Semi-cylindrical cathode
- High-vacuum
- S-1 spectral response
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| S-1 Response Test | 250 V | — | 1000000 | — | — |
Application Notes
Average cathode current density should not exceed 30 µA/sq.in. Load resistance of 1 megohm used for sensitivity measurements.
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