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EH9005

Long-life, high-reliability heptode designed specifically for electronic switching, with tight tolerances and an interface-free cathode for extended dependable operation.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Long-life high-reliability heptode for switching applications, with tight tolerances and an interface-free cathode.

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: 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

Heptode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 1 W
Max screen dissipation: 1 W
Max cathode current: 20 mA

Promoted values come from the supplied datasheet; additional ratings, characteristics, and operating points are retained in TUBE_SECTION_PARAMETER.

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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate supply voltage
150 V
Open
Screen-grid supply voltage
75 V
Open
Plate current minimum
5 mA
Open
Plate current maximum
6.5 mA
Open
Plate supply voltage
150 V
Blocked
Screen-grid supply voltage
75 V
Blocked
Plate current maximum
0.2 mA
Blocked
Plate cold voltage
550 V
Screen-grid cold voltage
550 V
Control-grid minimum voltage
-100 V
Suppressor-grid minimum voltage
-100 V
Heater-to-cathode voltage
120 V

Capacitance

Input capacitance control-grid
5.6 pF
Input capacitance screen-grid
6.8 pF
Output capacitance
8.3 pF
Control-grid to plate capacitance maximum
0.07 pF
Screen-grid to plate capacitance maximum
0.35 pF