4ES8

Frame-grid variable-mu twin triode designed for premium television tuners, providing low-noise cascode RF amplification with remote-cutoff behavior useful for gain-controlled VHF front ends.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 4 V / 600 mA

Description

4ES8 is a DualTriode device in the supplied Amperex literature. High-performance frame-grid twin triode with remote-cutoff characteristics for low-noise cascode RF service in premium television tuners.

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: 4 V
Nominal heater current: 600 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

Plate resistance: 2900 Ω
Transconductance: 0.0123 S
Amplification factor: 36
Max plate voltage: 130 V
Max plate dissipation: 1.8 W
Max cathode current: 20 mA

Representative row for two electrically identical variable-mu triode sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2900 Ω
Transconductance: 0.0123 S
Amplification factor: 36
Max plate voltage: 130 V
Max plate dissipation: 1.8 W
Max cathode current: 20 mA

Second physical triode section; electrically identical twin section.

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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
90 V
LowNoiseCascodeRF; EachUnit
Grid voltage
-1.2 V
LowNoiseCascodeRF; EachUnit
Plate current
15 mA
LowNoiseCascodeRF; EachUnit

Characteristic

Transconductance
12500 uS
EachUnit
Amplification factor
34
EachUnit
Plate resistance
2.72 kOhm
EachUnit

Data set 02

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
90 V
ClassA1
Grid voltage
-1.2 V
ClassA1
Plate current
15 mA
ClassA1

Characteristic

Plate resistance
2900 ohm
ClassA1
Transconductance
12300 uS
ClassA1
Amplification factor
36
ClassA1
Grid-to-cathode capacitance Section1
3.5 pF
Section1
Grid-to-plate capacitance Section1
1.9 pF
Section1
Grid-to-cathode capacitance Section2
6 pF
Section2
Grid-to-plate capacitance Section2
1.9 pF
Section2
Heater warm-up time
11 s
ControlledWarmUp