ECH4

Triode-hexode frequency changer for superheterodyne receiver service. Its integrated oscillator triode and multi-grid mixer provide the local oscillation and frequency-conversion functions required by the receiver front end.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 320 mA

Description

Triode-heptode/hexode frequency-converter tube for oscillator, mixer, and amplifier service. The supplied manufacturer datasheet provides heater data, electrical characteristics, ratings, capacitances, operating conditions, and application information where published.

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: 320 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 ratings and characteristics extracted from supplied datasheet.

Section 2

Heptode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings and characteristics extracted from supplied datasheet. Philips ECH4 is a triode-heptode (not triode-hexode) frequency changer with variable mutual conductance; the heptode can serve as frequency converter or HF/IF/LF amplifier. Other technical data are referenced to ECH21 by Philips; no unverified ECH21 maximum ratings are promoted.

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

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Ce
9.2 pF
Published datasheet value
Ce = 9,2 pF Ca
5.4 pF
Published datasheet value
Cagt <
0.002 pf
Published datasheet value
Cagt < 0,002 pf Cag = <
241 PF
Published datasheet value
cgl
2 pF
Published datasheet value
cgl = 2.0 pF Cg
0 pF
Published datasheet value
g3
8.9 pF
Published datasheet value
g3 = 8,9 pF Cut <
0.3 pF
Published datasheet value
cglgl «
0.2 pf
Published datasheet value
CglglH <
0.1 pF
Published datasheet value
Cgl+gl
14 pF
Published datasheet value
C(gT+g3)glH <
0.25 pF
Published datasheet value
c(gT+g3)eH <
0.1 pF
Published datasheet value