TH4B

Russian cold-cathode thyratron for low-power signal conversion.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: 0
Nominal heater: -

Description

The TH4B is a gas-discharge thyratron for pulse conversion.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 0
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

No fixed ratings are recorded for this section.

2026 Russian Thyratron Cold datasheet: cold-cathode miniature glass thyratron; anode-cathode 125 V; direct anode 225 V; maximum anode current 7–70 mA (nominal 38.5 mA); average 3.5 mA; grid-cathode 100 V; mass 4 (unit unspecified).

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

195X Russian

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristics

Second-grid extinguishing voltage
95 V
Published value
Anode-cathode voltage drop
125 V
Maximum
Ignition control-grid voltage
225 V
Published value
Gas pressure
5 mmHg
Published value
Warm-up time
30 s
Published value

Other

Average anode current
7 mA
Published limit
Control-grid current
3.6 mA
Published limit
Control-grid voltage
-60 to 100 V
Published operating range
Maximum pulse repetition rate
500 Hz
Published limit
Maximum pulse width
150 us
Published limit
Maximum duty cycle
10 percent
Published limit