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RK61

Subminiature gas thyratron for compact switching and control circuits. Its low-power directly heated filament suits small electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 4E
Socket code: -
Base pins: 4
Nominal heater: 1.4 V / 50 mA

Description

Subminiature directly heated three-element gas thyratron for self-quenching super-regenerative detector and relay-control service with very low space, weight, and battery drain.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 4E
Socket code: -
Base pins: 4
Nominal heater voltage: 1.4 V
Nominal heater current: 50 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

4E - 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: 45 V
Max cathode current: 1.5 mA

Special circuit—write for data; no standard electrical ratings printed in supplied table.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristics

Heater or filament voltage
1.4 V
Published nominal value
Heater or filament current
50 mA
Published nominal value
Average tube voltage drop
30 V
At 1.5 mA anode current
Recommended upper operating frequency
100 MHz
Operation above this frequency is stated to be apt to be unstable

Capacitance

Grid-to-anode capacitance
1.6 pF
Approximate; no external shield
Grid-to-filament capacitance
1.1 pF
Approximate; no external shield
Filament-to-anode capacitance
1 pF
Approximate; no external shield

Other

Maximum anode voltage
45 V
Design-center maximum
Maximum anode current
1.5 mA
Design-center maximum
Relay resistance
5000 ohm
Recommended relay-control circuit
Anode current without signal
1 to 1.5 mA
Self-quenching super-regenerative detector
Anode current with signal
0.1 to 0.5 mA
Self-quenching super-regenerative detector

Data set 02

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

Filament voltage
1.4 V
Filament current
50 mA