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Voltage Regulator ·VoltageRegulator

4687K

Cold-cathode gas-filled voltage stabilizer and reference tube operating around 95 V for shunt-regulator service.

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

Description

The Philips 4687K is a cold-cathode voltage stabiliser operating at about 95 V.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
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
95 V
Regulator minimum current
10 mA
Regulator maximum current
40 mA
Regulator starting voltage
130 V
Regulator maintaining voltage
95 V

Cold-cathode gas-filled Philips voltage stabilizer/reference tube.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristics

  • Operating Voltage

    95 V

    Ia=20mA

  • Regulation

    10 V

    Ia=10-40mA

Other

  • Ignition Voltage Maximum

    130 V

    Ambient illumination

Data set 02

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristic

  • Maintaining voltage at 20 mA

    95 V

  • Voltage regulation

    - to 10 V

    Ia=10-40mA