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Tube Tinker — Electron Tube Database
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Specialized - Photo Tube ·PhotoemissiveDetector

QVA39

Quartz-envelope vacuum photocell with Type-QA response peaking near 370 nm for ultraviolet and near-ultraviolet measurement.

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

Description

Quartz-envelope vacuum photocell with Type QA spectral response and maximum response near 3700 Å.

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
Max plate voltage
50 V

Published ratings and characteristics promoted from the approved datasheet.

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

196X Cintel

Published operating points and test conditions from this source.

SECTION 1

PhotoemissiveDetector

Other

  • Inter-electrode capacitance

    8 pF

    Published datasheet value

  • Maximum average cathode current

    1 uA

    Published datasheet value

  • Maximum peak cathode current

    4 uA

    Published datasheet value

Characteristic

  • Operating voltage minimum

    30 V

    Published datasheet value

  • Operating voltage maximum

    50 V

    Published datasheet value

  • Minimum sensitivity

    20 uA/lumen

    Published datasheet value