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Z700U

Subminiature cold-cathode trigger tube for counting and switching circuits. Heaterless gas discharge provides compact digital control.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

The Z700U is a subminiature cold-cathode trigger tube with a primer cathode, intended for decade counting and switching circuits. It uses positive triggering and requires a small continuous priming discharge for stable light/dark characteristics.

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

Thyratron

X-ray radiationInterelectrode capacitances

Max plate voltage: 310 V
Max cathode current: 4 mA
Regulator minimum current: 2 mA
Regulator maximum current: 4 mA
Regulator starting voltage: 153 V
Regulator maintaining voltage: 116 V

Published Mullard cold-cathode ratings and operating characteristics promoted where applicable; additional trigger/display values retained as parameters.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristics

Trigger ignition voltage range
137 to 153 V
PositiveTrigger
Anode-cathode maintaining voltage range at 3 mA
111 to 121 V
Trigger-cathode maintaining voltage typical
115 V
Trigger ignition voltage drift typical maximum
3 V
Long-ignition trigger ignition voltage shift maximum
175 V
Maximum counting speed
5 kHz

Other

Recommended anode working voltage range
200 to 310 V
Recommended average cathode current range
2.0 to 4.0 mA
Priming cathode resistor recommended
18 Mohm
Minimum anode-to-priming-cathode supply voltage
200 V
Priming discharge current typical
3 uA
Transfer current maximum at 250 V
30 uA
Anode voltage maximum
310 V
Cathode current peak maximum
16 mA
Pulse
Cathode current average maximum over 1 s
4 mA
Negative trigger current maximum while ignited
100 uA
Short trigger pulse width
20 us
Pulse
Short-pulse trigger voltage minimum
153 V
Pulse
Short-pulse trigger voltage typical with 100 pF coupling
175 V
Pulse

Application

Application
Decade counting / switching