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

Nixie ·Nixie

Z568M

Gas-filled cold-cathode Nixie numerical indicator designed for decimal readout by selective glow discharge of shaped numeral cathodes.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
17–35
Socket code
SK137
Base pins
-
Nominal heater
-

Description

Z568M is a cold-cathode Nixie numerical/symbol indicator tube. The supplied RFT sheet gives 150 V ignition and 140 V burning voltage, a 200 V minimum operating supply, 4–7 mA cathode current, and 50 mm side-viewed symbols. Z568M is tabulated directly in the supplied RFT display-tube data sheet.

Socket description

SK-137 / RTS-5 17-contact large Nixie socket family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
17–35
Socket code
SK137
Base pins
-
Nominal heater voltage
-
Nominal heater current
-
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

17–35 - 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

Nixie

X-ray radiationInterelectrode capacitances
Max cathode current
7 mA

Cold-cathode glow-display section; maximum cathode current promoted in amperes.

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

1971 Nixie RFT

Published operating points and test conditions from this source.

SECTION 1

Nixie

Characteristic

  • Anode Ignition Voltage

    150 V

    Published RFT table

  • Anode Burning Voltage

    140 V

    Published RFT table

  • Anode Extinction Voltage

    120 V

    Published RFT table

Other

  • Minimum Operating Voltage

    200 V

    Published RFT table

  • Minimum Cathode Current

    4 mA

    Published RFT table

  • Maximum Cathode Current

    7 mA

    Published RFT table

  • Peak Cathode Current

    25 mA

    Published RFT table

  • Minimum Ambient Temperature

    -10 degC

    Published RFT table

  • Maximum Ambient Temperature

    50 degC

    Published RFT table

  • Symbol Height

    50 mm

    Published RFT table

  • Maximum Viewing Distance

    30 m

    Published RFT table

  • Maximum Bulb Height

    100 mm

    Published RFT table

  • Maximum Bulb Diameter

    50 mm

    Published RFT table