Tube-number record
1P42
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BrandRCA
ClassVacuum Phototube
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeT-2
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage180 V
Cathode Current0.0004 mA
Audio Performance
Key Features
- Head-on type
- S-9 spectral response
- Compact T-2 bulb
- Circular cathode shape
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| S-9 Response | 180 V | — | — | — | 0.000005 mA |
Application Notes
Exposure to intense illumination, such as direct sunlight, may decrease sensitivity even without applied voltage. Shielding recommended when amplifier gain or load resistance is high.
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