R45

Russian spark-gap switching/protection tube for television overvoltage protection.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

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 0

SparkGapPulseSwitch

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Unspecified spark-gap switching device; breakdown/spark voltage 0.45 kV, range 0.3–0.6 kV. Not an ordinary plate-voltage rating. Additional datasheet specifications: Anode current 0.05 A; life 50 pulses.

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

2026 Russian Spark Gap

Published operating points and test conditions from this source.

SECTION 0

SparkGapPulseSwitch

Other

Breakdown voltage
0.3 to 0.6 kV
Spark-gap breakdown voltage, nominal with source minimum/maximum; not a conventional anode rating
Maximum pulse duration
70 µs
Published pulse duration; R24 nominal 4.5 µs, source range 4–5 µs

Characteristic

Pulse repetition rate
3 Hz
Nominal spark repetition frequency