Specialized - Photo Tube ·PhotoemissiveDetector
1P29
RCA 1P29 gas-filled side-on S-3 photoemissive detector with semicylindrical photocathode, peak response near 420 nm, and gas amplification up to 9.
- 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 1P29 gas-filled S-3 side-on photoemissive detector. 1961 two alternative rating regimes: Rating I anode supply max 80 V, average photocathode current max 10 µA, density max 50 µA/in²; Rating II anode supply max 100 V, average photocathode current max 5 µA, density max 25 µA/in². Promoted 100 V is valid ONLY with Rating II 5 µA/25 µA-in² restrictions; do not combine with Rating I current. Earlier 1944 max average cathode current 20 µA superseded. Gas amplification factor <=9. Peak S-3 response 420±100 nm, radiant sensitivity ~0.011 A/W at 420 nm, median luminous sensitivity 40 µA/lm DC, 35 µA/lm at 5 kHz, 31 µA/lm at 10 kHz. Anode dark current max 0.10 µA at 25 °C; capacitance ~3 pF; max ambient 100 °C. Minimum load resistance conditional on voltage/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.