Z521M

Cold-cathode Nixie indicator displaying special front-viewed symbols approximately 15.5 mm high rather than ordinary decimal digits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 13–17 TGL 68-87
Socket code: B13B
Base pins: -
Nominal heater: -

Description

Z521M is a cold-cathode Nixie numerical/symbol indicator tube. The supplied RFT sheet gives 145 V ignition and 135 V burning voltage, a 170 V minimum operating supply, 1–2.5 mA cathode current, and 15.5 mm front-viewed symbols. Page 5 identifies Z521M as comparable to Z561M; electrical/display values are taken from the Z561M table column.

Socket description

B13B Nixie 13-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 13–17 TGL 68-87
Socket code: B13B
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

13–17 TGL 68-87 - 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 plate voltage: 170 V
Max cathode current: 2.5 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
145 V
Comparable type Z561M
Anode Burning Voltage
135 V
Comparable type Z561M
Anode Extinction Voltage
120 V
Comparable type Z561M

Other

Minimum Operating Voltage
170 V
Comparable type Z561M
Minimum Cathode Current
1 mA
Comparable type Z561M
Maximum Cathode Current
2.5 mA
Comparable type Z561M
Peak Cathode Current
10 mA
Comparable type Z561M
Minimum Ambient Temperature
-50 degC
Comparable type Z561M
Maximum Ambient Temperature
70 degC
Comparable type Z561M
Symbol Height
15.5 mm
Comparable type Z561M
Maximum Viewing Distance
10 m
Comparable type Z561M
Maximum Bulb Height
26.5 mm
Comparable type Z561M
Maximum Bulb Diameter
30.1 mm
Comparable type Z561M