ECH8000

Triode-heptode combination for frequency-changing and related signal-processing duties. The triode supplies oscillator or amplifier action while the multi-grid section handles mixing or controlled signal processing.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Remote-cutoff heptode with triode; triode oscillator and heptode mixer/RF-IF amplifier.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published Telefunken values promoted where applicable; additional values retained as parameters.

Section 2

Hexode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published Telefunken values promoted where applicable; additional values retained as parameters.

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

Triode

Application

Application
Oscillator

SECTION 2

Hexode

Application

Application
Mixer / RF-IF amplifier

Characteristics

Cutoff characteristic
Remote cutoff