Tube-number record
928
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BrandRCA
ClassGas Phototube
Base4-pin
Construction
Primary TypeOther / special
EnvelopeT9
Base MaterialSmall-Shell Small 4-Pin
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage90 V
Cathode Current0.015 mA
Audio Performance
Key Features
- Non-directional
- Cylindrical Mesh Cathode
- S-1 Response
- Lime glass bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Gas Amplified | 90 V | — | — | 10 | 0.006 mA |
Application Notes
The gas amplification factor is the ratio of luminous sensitivity at an anode supply voltage of 90 volts to luminous sensitivity at 25 volts. Sensitivity measurements are based on a tungsten-filament lamp operated at 2870°K.
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