Specialized - Photo Tube ·Photomultiplier
1P22
RCA 1P22 nine-stage side-on S-8 photomultiplier tube with cesium-bismuth photocathode and cesium-antimony dynodes, designed for colorimetry, spectroscopy and low-light measurement.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 11
- Nominal heater
- -
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 11
- Nominal heater voltage
- -
- Nominal heater current
- -
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
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
Photomultiplier
- Max plate voltage
- 1250 V
RCA 1P22 nine-stage S-8 side-on photomultiplier. Maximum anode-to-cathode supply 1250 V DC/peak AC; maximum anode-to-dynode9 250 V, each consecutive dynode gap 250 V, dynode1-cathode 250 V. Average ANODE output current max 1 mA, peak ANODE current max 10 mA (1948); not cathode current ratings. Typical at 1000 V supply: gain ~330000, luminous sensitivity ~1 A/lm; at 750 V gain ~48000, sensitivity ~0.145 A/lm (1963). Peak spectral response 365±50 nm in 1963 RCA data, 420±50 nm in 1948 RCA data. Cesium-bismuth photocathode, nine cesium-antimony dynodes. Anode-dynode9 capacitance ~4–4.4 pF, anode-to-other ~6–6.5 pF. Ambient max 50 °C, no heater.
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.