Specialized - Photo Tube ·PhotoemissiveDetector
1P37
RCA 1P37 gas-filled side-on S-4 photoemissive detector with blue-light sensitivity, semicylindrical photocathode and gas amplification up to 5.5.
- Sections
- 1
- Base
- 2K
- Socket code
- -
- Base pins
- 4
- Nominal heater
- -
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 2K
- Socket code
- -
- Base pins
- 4
- Nominal heater voltage
- -
- Nominal heater current
- -
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
2K - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
PhotoemissiveDetector
- Max plate voltage
- 100 V
RCA 1P37 gas-filled S-4 side-on photoemissive detector. 1961 alternative absolute rating regimes: Rating I anode max 80 V, average cathode current max 10 µA, current density max 50 µA/in²; Rating II anode max 100 V, average cathode current max 5 µA, density max 25 µA/in². Promoted 100 V is conditional on Rating II restrictions, not combinable with Rating I current. Ambient max 75 °C. Peak spectral response 400±50 nm, median radiant sensitivity 0.13 A/W at 400 nm; median luminous sensitivity 135 µA/lm DC, 124 µA/lm at 5 kHz, 108 µA/lm at 10 kHz. Gas amplification factor max 5.5; dark current max 0.05 µA at 25 °C, capacitance ~3 pF. Conditional load-resistance minimum depends on voltage and current.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.