1P42

RCA 1P42 miniature high-vacuum head-on S-9 photoemissive detector with semitransparent circular photocathode, peak response near 480 nm, and opposed end terminals.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: 2
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: 2
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

PhotoemissiveDetector

X-ray radiationInterelectrode capacitances

Max plate voltage: 180 V
Max cathode current: 0.0004 mA

RCA 1P42 miniature high-vacuum S-9 head-on photoemissive detector. Maximum anode supply 180 V DC/peak AC, average cathode current max 0.4 µA, average cathode-current density max 25 µA/in², peak cathode current max 1.5 µA (1950), ambient max 75 °C. Dark current max 0.005 µA at 25 °C. Peak spectral response 480±50 nm; 1960 median radiant sensitivity 0.025 A/W at 480 nm and luminous sensitivity 37 µA/lm; 1950 average 0.020 A/W and 30 µA/lm. Interelectrode capacitance 1.9 pF, semitransparent circular photocathode, optical window area 0.030 in² and diameter >=0.19 in. No heater; small-end anode and large-end photocathode.

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.

No source-specific operating conditions are recorded.