Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Photo Tube ·PhotoemissiveDetector

1P27

Gas-filled two-electrode phototube with high red and infrared sensitivity for photoelectric detection.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
-

Description

The 1P27 is a gas-filled two-electrode phototube with high sensitivity in the red and infrared.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
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

No fixed ratings are recorded for this section.

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.

Data set 01

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

PhotoemissiveDetector

Characteristic

  • Luminous sensitivity at 90 V 0 cycles

    150 uA/lm

  • Maximum gas amplification

    10.5

  • Interelectrode capacitance

    3 pF

  • Maximum dark current at 90 V

    0.1 uA

  • Wavelength of maximum response

    8000 angstrom

  • Sensitivity at maximum response

    0.0145 uA/uW

Other

  • Anode voltage

    100 V

  • Cathode current density

    102 uA/in2

  • Ambient temperature maximum

    100 C