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Voltage - Dual Triode (similar high frequency) ·Triode-Triode

ECC88

Industrial medium-mu high-transconductance twin triode designed for low-noise cascode amplification in VHF television tuners, with low equivalent noise resistance for sensitive receiver front ends.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9AJ
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 365 mA

Description

Medium-mu industrial twin triode used as a cascode amplifier in VHF color and black-and-white 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: 9AJ
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 365 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AJ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN22G1	B	G1 — Control Grid Source label preserved; pending confirmation	Unverified EIA Base Connections, printed page 131, 9AJ
PIN32K	B	K — Cathode Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN4H	—	H — Heater Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN5H	—	H — Heater Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN61P	A	P — Plate (Anode) Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN71G1	A	G1 — Control Grid Source label preserved; pending confirmation	Unverified EIA Base Connections, printed page 131, 9AJ
PIN81K	A	K — Cathode Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN9IS	A	IS — Internal Screen Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2640 Ω
Transconductance: 0.0125 S
Amplification factor: 33
Max plate voltage: 130 V
Max plate dissipation: 1.85 W
Max cathode current: 25 mA

Published maximum ratings/characteristics promoted from source.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2640 Ω
Transconductance: 0.0125 S
Amplification factor: 33
Max plate voltage: 130 V
Max plate dissipation: 1.85 W
Max cathode current: 25 mA

Second physical triode restored.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
365 mA
Nominal
Maximum Plate Voltage
130 V

Characteristic

Transconductance
12500 µS
Typical
Amplification Factor
33
Typical
Plate Resistance
2640 ohm
Typical

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
365 mA
Published heater rating
Amplification factor
33
CascodeRF
Plate resistance
2650 ohm
CascodeRF
Transconductance
12500 µS
CascodeRF

Other

Plate voltage
90 V
CascodeRF
Control-grid bias
-1.3 V
CascodeRF
Plate current
15 mA
CascodeRF

Data set 03

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
90 V
Plate current
15 mA
Maximum plate voltage
130 V
Maximum plate dissipation
1.85 W
Maximum cathode current
25 mA

Characteristic

Transconductance
12500 uS
Amplification factor
33
Plate resistance
2.64 kohm
Equivalent noise resistance
300 ohm

Capacitance

Grid-plate capacitance
1.4 pF
Input capacitance
3.3 pF
Output capacitance
2.5 pF

Data set 04

1967 Mullard Receiving and Amplifying Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Current
15 mA
EachSection;Va=90V
Transconductance
12500 uS
EachSection;Va=90V
Amplification Factor
33
EachSection;Va=90V
Plate Resistance
2600 ohm
EachSection;Va=90V
Plate Resistance
2600 ohm
Transconductance
12500 uS
Amplification Factor
33

Other

Maximum Plate Voltage
130 V
Maximum Plate Dissipation
1.8 W
Maximum Cathode Current
25 mA
Interelectrode Capacitance Data Published
1
SourceTablePresent

Data set 05

1972 Philips Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage Vi
6.3 V
Heater current I
365 mA

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Load Resistance 2000
4000 Ω
Published in approved ECC88 target datasheet entry; Section1
TotalHarmonic Distortion .... 10
10 %
Published in approved ECC88 target datasheet entry; Section1
Maximum-Signal Power Output 2.1
3.8 W
Published in approved ECC88 target datasheet entry; Section1
For fixed-bias operation
0.1 MΩ
Published in approved ECC88 target datasheet entry; Section1
For cathode-bias operation
0.5 MΩ
Published in approved ECC88 target datasheet entry; Section1
Heater Voltage (ac/dc)
6.3 V
Published in approved ECC88 target datasheet entry; Section1
Heater Current
365 mA
Published in approved ECC88 target datasheet entry; Section1
Peak value
-150 V
Published in approved ECC88 target datasheet entry; Section1
Average value 50
-130 V
Published in approved ECC88 target datasheet entry; Section1
Plate Supply Voltage
130 V
Published in approved ECC88 target datasheet entry; Section1
Cathode Current
25 mA
Published in approved ECC88 target datasheet entry; Section1
Plate Dissipation
1.8 W
Published in approved ECC88 target datasheet entry; Section1
Negative Grid "Voltage
50 V
Published in approved ECC88 target datasheet entry; Section1
Plate Supply Voltage (cold condition)
550 V
Published in approved ECC88 target datasheet entry; Section1
Plate Current
15 mA
Published in approved ECC88 target datasheet entry; Section1
Equivalent Noise Resistance
300 Ω
Published in approved ECC88 target datasheet entry; Section1
Grid-Circuit Resistance
1 MΩ
Published in approved ECC88 target datasheet entry; Section1
Heater to Cathode Circuit Resistance
0.02 MΩ
Published in approved ECC88 target datasheet entry; Section1

Capacitance

Grid to Plate 1.4
1.4 pF
Published in approved ECC88 target datasheet entry; Section1
Grid to Cathode, Heater, and Internal Shield
3.3 pF
Published in approved ECC88 target datasheet entry; Section1
Cathode to Grid, Heater, and Internal Shield
6 pF
Published in approved ECC88 target datasheet entry; Section1
Plate to Cathode, Heater, and Internal Shield
1.8 pF
Published in approved ECC88 target datasheet entry; Section1
Plate to Grid, Heater, and Internal Shield
2.8 pF
Published in approved ECC88 target datasheet entry; Section1
Plate to Cathode
1.8 pF
Published in approved ECC88 target datasheet entry; Section1
Heater to Cathode
2.7 pF
Published in approved ECC88 target datasheet entry; Section1
Grid to Heater
0.13 pF
Published in approved ECC88 target datasheet entry; Section1
Plate of Unit No. 1 to Plate of Unit No. 2
0.045 pF
Published in approved ECC88 target datasheet entry; Section1
Grid of Unit No. 2 to Plate of Unit No. 1
0.005 pF
Published in approved ECC88 target datasheet entry; Section1

Data set 07

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage Vi
6.3 V
Heater voltage Vi 6.3 V
Heater current I
365 mA
Heater current I 365 mA