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Voltage Radio Detector Converter ·Tetrode-Triode

6CL8A

Miniature triode-tetrode used as a combined VHF oscillator and mixer in color and black-and-white television receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9FX
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 450 mA

Description

Miniature type used as combined vhf oscillator and mixer in color and black-and-white television receivers.

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: 9FX
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9FX - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	B	G1 — Control Grid Literal label 2G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN2Base Pin	B	P — Plate (Anode) Literal label 2P; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN3Base Pin	B	K — Cathode Literal label 2K; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN4Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN5Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN6Base Pin	A	P — Plate (Anode) Literal label 1P; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN7Base Pin	A	G2 — Screen Grid Literal label 1G2; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN8Base Pin	A	K — Cathode Literal label 1K; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX
PIN9Base Pin	A	G1 — Control Grid Literal label 1G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9FX

Section ratings

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.007 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 3 W
Max screen dissipation: 0.55 W
Rectifier max heater-cathode voltage: 200 V

Sharp-cutoff tetrode

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.008 S
Amplification factor: 40
Max plate voltage: 330 V
Max screen voltage: 125 V
Max plate dissipation: 2.5 W
Rectifier max heater-cathode voltage: 200 V

Medium-mu triode

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

TetrodeTransconductance
8000 uS
Section1
Heater Warmup Time
11 s

SECTION 2

Triode

Characteristic

TriodeTransconductance
6500 uS
Section2

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Plate Voltage
125 V
Screen Voltage
125 V
Grid Voltage
-1 V
Plate Current
12 mA
Screen Current
4 mA

Characteristics

Plate Resistance
200000 ohm
Transconductance
6500 uS

SECTION 2

Triode

Characteristics

Heater Voltage
6.3 V
Heater Current
450 mA
Amplification Factor
40 ratio
Plate Resistance
5000 ohm
Transconductance
8000 uS

Other

Plate Voltage
125 V
Grid Voltage
-1 V

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

Tetrode grid-to-plate capacitance
0.02 pF
WithoutShield
Tetrode grid-to-plate capacitance
0.01 pF
WithShield
Tetrode input capacitance
5 pF
Tetrode output capacitance
2 pF
WithoutShield

Other

Plate voltage
125 V
ClassA
Grid #2 voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
12 mA
ClassA
Grid #2 current
4 mA
ClassA

Characteristic

Zero-bias transconductance
7000 uS
Eb=100V;Ec2=70V

SECTION 2

Triode

Capacitance

Triode grid-to-plate capacitance
1.8 pF
Triode input capacitance
2.8 pF
Triode output capacitance
1.5 pF
WithoutShield

Other

Heater warm-up time
11 s
Plate voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
24 mA
ClassA

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

plate
0.015 pF
Published table column 1 of 2
plate
0.01 pF
Published table column 2 of 2
plate
0 pF
Published table column 1 of 3
plate
15 pF
Published table column 2 of 3
plate
0.03 pF
Published table column 3 of 3
Heater to cathode (Each Unit)
3 pF
Published table column 1 of 2
Heater to cathode (Each Unit)
3 pF
Published table column 2 of 2
/'+. Plate Voltage
125 V
Published table column 1 of 3
/'+. Plate Voltage
100 V
Published table column 2 of 3
/'+. Plate Voltage
125 V
Published table column 3 of 3
Grid-No.i Voltage
-1 V
Published table column 1 of 2
Grid-No.i Voltage
-1 V
Published table column 2 of 2
Plate Resistance (Approx.)
5000 Ω
Published table column 1 of 2
Plate Resistance (Approx.)
200000 Ω
Published table column 2 of 2
Transconductance
8000 µS
Published table column 1 of 3
Transconductance
7000 µS
Published table column 2 of 3
Transconductance
6500 µS
Published table column 3 of 3
Plate Current
14 mA
Published table column 1 of 2
Plate Current
12 mA
Published table column 2 of 2
for plate µa =
20 V
Published table column 1 of 3
for plate µa =
-9 V
Published table column 2 of 3
for plate µa =
-9 V
Published table column 3 of 3

Other

PLATE VOLTAGE
330 V
Published table column 1 of 2
PLATE VOLTAGE
330 V
Published table column 2 of 2
SUPPLY VOLTAGE
330 V
Positive-bias value
0 V
Published table column 1 of 2
Positive-bias value
0 V
Published table column 2 of 2
up to
165 W
Published table column 1 of 2
up to
0.55 W
Published table column 2 of 2
between 165 and
330 V
PLATE DISSIPATION
2.5 W
Published table column 1 of 2
PLATE DISSIPATION
3 W
Published table column 2 of 2
respect to cathode
200 V
Published table column 1 of 2
respect to cathode
200 V
Published table column 2 of 2
For fixed—bias operation
0.5 MΩ
Published table column 1 of 2
For fixed—bias operation
0.25 MΩ
Published table column 2 of 2
For cathode—bias operation
1 MΩ
Published table column 1 of 2
For cathode—bias operation
1 MΩ
Published table column 2 of 2
The do component must not exceed
100 V
Maximum Plate Voltage
330 V
Converter
Maximum Screen Supply Voltage
330 V
Converter
Maximum Plate Dissipation
3 W
Converter
Maximum Screen Input
0.55 W
Converter

SECTION 2

Triode

Characteristics

Warrrr-up time (Average)
11 s
Grid to plate
1.8 pF
Published table column 1 of 2
Grid to plate
1.8 pF
Published table column 2 of 2

Other

Maximum Plate Voltage
330 V
Converter
Maximum Plate Dissipation
2.5 W
Converter

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 2

Triode

Capacitance

Grid to Plate
1.8 pF
Published datasheet value
Plate to Cathode, Heater, Grid No
2
Published datasheet value
Tetrode Plate to Triode Plate
0.03 pF
Published datasheet value
Heater to Cathode (Each Unit)
3 pF
Published datasheet value
Plate to Cathode and Heater
20 pF
Published datasheet value
Heater to Cat' de
4 PF
Published datasheet value

Characteristic

Plate Supply Voltage
125 volts
Published datasheet value
Grid-No
125 volts
Published datasheet value
Grid-No
-1 volt
Published datasheet value
Amplification Factor
40
Published datasheet value
Plate Resistance (Approx.)
0.2 megohm
Published datasheet value
Transconductance
6500
Published datasheet value
Plate Current
12 mA
Published datasheet value
Grid-No
4 mA
Published datasheet value