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

Voltage Regulator ·VoltageRegulator

SR4

Subminiature molybdenum-cathode reference tube maintaining approximately 85 V over 0.5–5 mA, with low temperature coefficient and at least 30,000 hours specified life.

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

Description

Subminiature voltage reference tube with cold molybdenum cathode for a 0.5-5 mA stabilizing range and DC-amplifier coupling/reference service.

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

Voltage Regulator

X-ray radiationInterelectrode capacitances
Regulator voltage
85 V
Regulator minimum current
0.5 mA
Regulator maximum current
5 mA
Regulator starting voltage
105 V
Regulator maintaining voltage
85 V

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

1962 Cerberus

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristics

  • Breakdown voltage

    100 to 110 V

  • Stabilized voltage

    84 to 86 V

    1.5mA

  • Temperature coefficient

    -4 mV/C

    IA=3mA

  • Service life minimum

    30000 h

Other

  • Regulation

    1 V

    0.5-3mA