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6E5S

Russian indirectly heated electron-beam tuning indicator used to display receiver tuning or signal strength. Its fluorescent display and control-electrode response provide a visible indication rather than conventional tetrode voltage amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

Tetrode vacuum tube described in the bilingual source.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
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

Tuning Indicator

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V

Russian 6E5S (6Е5С) indirectly heated electron-beam fluorescent TUNING INDICATOR, not ordinary amplifier tetrode. Manufacturer description specifies indicator operation for visual tuning of radio/electronic equipment. Reported heater nominal 6.3 V 0.3 A, anode operating around 250 V and control/grid typical -4 V, anode current about 5.3 mA; summary gives control sensitivity/gain 24 (range 22–26) and transconductance 1.2 mA/V (range 0.8–1.6) but such indicator measurements must not be treated automatically as conventional tetrode intrinsic gm. Existing max_plate_voltage 250 V retained as approved; operating values documented separately. Eight-contact construction and available Russian reference should be reconciled with actual indicator basing in a separate base audit.

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

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Tuning Indicator

Characteristics

Published electrical parameter
4 V
при 0,=6,3 В, (0,==250 В, Идк=250 В, И,=—4 В
Reverse current
2 µA
Обратный ток сетки . . . . , . . . . . . 2 мкА
Cutoff voltage
5±4.5 V
Напряжение отсечки тока анода (отрицательное) 5=4,5 В
Heater voltage
5.7—6.9 V
Напряжение накала . . . . . . .. . , , 5,7—6,9 В
Plate voltage
250 V
Напряжение анода . . ее , 250 В
Plate voltage
140—250 V
Напряжение анода кратера ж . . . , 140—250 В
Published electrical parameter
100 V
Напряжение между катодом и подогревателем ‚ж 100 В