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Voltage Triode Pentode ·Pentode-Triode

6HF8

High-mu triode plus high-transconductance pentode for television amplifier and synchronization service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9DX
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 750 mA

Description

High-mu triode plus high-transconductance pentode for television amplifier and sync service.

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: 9DX
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 750 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9DX - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN22G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN32P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN4H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN5H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN61G3	A	G3 — Suppressor GridGroup 9DX6 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN6IS	A	IS — Internal ScreenGroup 9DX6 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN61K	A	K — CathodeGroup 9DX6 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN71G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN81G2	A	G2 — Screen Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN91P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 37000 Ω
Transconductance: 0.0027 S
Amplification factor: 100
Max plate voltage: 330 V
Max plate dissipation: 1 W

Published maximum ratings and characteristic values promoted where applicable; additional table values retained in TUBE_SECTION_PARAMETER.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 75000 Ω
Transconductance: 0.0125 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 5 W
Max screen dissipation: 1.1 W

Published maximum ratings and characteristic values promoted where applicable; additional table values retained in TUBE_SECTION_PARAMETER.

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

Triode

Other

Screen Voltage
2 V
Published operating/characteristic table
Grid Voltage
0 V
Published operating/characteristic table
Cathode Resistor
68 ohm
Published operating/characteristic table

Characteristic

Plate Current
26 mA
Published operating/characteristic table
Screen Current
7 mA
Published operating/characteristic table
Transconductance
12500 uS
Published operating/characteristic table
Amplification Factor
70
Published operating/characteristic table
Plate Resistance
75000 ohm
Published operating/characteristic table

SECTION 2

Pentode

Other

Screen Voltage
2 V
Published operating/characteristic table
Grid Voltage
0 V
Published operating/characteristic table
Cathode Resistor
68 ohm
Published operating/characteristic table

Characteristic

Plate Current
26 mA
Published operating/characteristic table
Screen Current
7 mA
Published operating/characteristic table
Transconductance
12500 uS
Published operating/characteristic table
Amplification Factor
70
Published operating/characteristic table
Plate Resistance
75000 ohm
Published operating/characteristic table

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
3.5 pF
Input capacitance
2.8 pF
Output capacitance
2.6 pF

Other

Plate supply voltage
200 V
ClassA1
Grid 1 voltage
-2 V
ClassA1
Plate current
4 mA
ClassA1

SECTION 2

Pentode

Capacitance

Grid 1 to plate capacitance
0.1 pF
Input capacitance
10 pF
Output capacitance
4.2 pF

Other

Plate supply voltage
200 V
ClassA1
Screen supply voltage
125 V
ClassA1
Plate current
25 mA
ClassA1

Data set 03

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
200 V
ClassA
Plate current
4 mA
ClassA
Maximum plate voltage
330 V
Grid No.l to plate
0.1 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
PLATE VOLTAGE — published value 1
330 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
PLATE VOLTAGE — published value 2
330 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
SUPPLY VOLTAGE
330 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Positive-bias value — published value 1
0 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Positive-bias value — published value 2
0 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
PLATE DISSIPATION — published value 1
1 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
PLATE DISSIPATION — published value 2
5 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
respect to cathode — published value 1
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
respect to cathode — published value 2
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
respect to cathode — published value 1
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
respect to cathode — published value 2
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
For fixed-bias operation — published value 1
0.5 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
For fixed-bias operation — published value 2
0.25 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
For cathode-bias operation — published value 1
1 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
For cathode-bias operation — published value 2
1 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.

Characteristics

Plate resistance
17500 ohm
ClassA
Transconductance
4000 uS
ClassA
Amplification factor
70
ClassA
Voltage (AC or DC) — published value 1
6.3 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Voltage (AC or DC) — published value 2
10 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Current at 6.3 volts — published value 1
6.3 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Current at 6.3 volts — published value 2
0 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Current at 6.3 volts — published value 3
75 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid to plate
3.5
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
and heater
2.8
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
and heater
2.6
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
heater
10
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
No.2, and heater
4.2
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
1 Plate Supply Voltage — published value 1
1 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
1 Plate Supply Voltage — published value 2
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
1 Plate Supply Voltage — published value 3
45 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
1 Plate Supply Voltage — published value 4
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid-No.2 Supply Voltage — published value 1
125 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid-No.2 Supply Voltage — published value 2
125 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid-No.1 Voltage — published value 1
-2 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid-No.1 Voltage — published value 2
0 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Cathode Resistor
68 ohm
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Plate Resistance (Approx ) — published value 1
17500 ohm
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Plate Resistance (Approx ) — published value 2
75000 ohm
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Transconductance — published value 1
4000
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Transconductance — published value 2
12500
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Plate Current — published value 1
4 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Plate Current — published value 2
40 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Plate Current — published value 3
25 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid-No.2 Current — published value 1
15 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Grid-No.2 Current — published value 2
7 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
for plate µa = 100 — published value 1
100 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
for plate µa = 100 — published value 2
-9 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
for plate — published value 1
20 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
for plate — published value 2
-6 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Pin 2 -Triode
2
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Pin 4 -Heater
4
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
PLATE VOLTS=200
200 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
GRID-N'2 VOLTS=125 — published value 1
2 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
GRID-N'2 VOLTS=125 — published value 2
125 V
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.

SECTION 2

Pentode

Other

Plate voltage
200 V
ClassA
Plate current
25 mA
ClassA
Maximum plate voltage
330 V
Maximum screen-grid voltage
330 V
Triode grid to pentode plate
0.015 mA
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.

Characteristics

Plate resistance
75000 ohm
ClassA
Transconductance
12500 uS
ClassA
Plate
7
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Pin 5 -Heater — published value 1
5
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.
Pin 5 -Heater — published value 2
8
Published datasheet value; multiple values on one source row represent separate limits or operating conditions.

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid to Plate
3.6 pF
Grid to Plate 3.6 pF

Other

Grid to Cathode, Heater, Pentode Cathode, Grid No
3
Grid to Cathode, Heater, Pentode Cathode, Grid No.3,
Plate to Cathode, Heater, Pentode Cathode, Grid No
3
Plate to Cathode, Heater, Pentode Cathode, Grid No.3,
Plate Dissipation
5 watts
Plate Dissipation 1 5 watts
Grid-No
2
Grid-No.2 Input:
Plate Dissipation
2 watts
Plate Dissipation 1.5 2 watts
Grid-No
0.5 watt
Grid-No.2 Input - 0.5 watt

Characteristic

Plate Voltage
330 volts
Plate Voltage 330 330 volts
Grid-No
330 volts
Grid-No.2 (Screen-Grid) Supply Voltage - 330 volts
Grid-No
2
Grid-No.2 Voltage
For grid-No
165 volts
For grid-No.2 voltages up to 165 volts -
For grid-No
330 volts
For grid-No.2 voltages between 165 and 330 volts
Plate Supply Voltage
200 volts
Plate Supply Voltage 200 45 200 volts
Grid-No
125 volts
Grid-No.2 Supply Voltage - 125 125 volts
Grid-No.l Voltage
2
Grid-No.l Voltage -- 2
Amplification Factor
70
Amplification Factor 70 - -
Plate Resistance (Approx.)
75000 ohms
Plate Resistance (Approx.) 17500 - 75000 ohms
Transconductance
12500
Transconductance 4000 - 12500 /xmhos
Plate Current
25 mA
Plate Current 40* 25 mA
Grid-No
2
Grid-No.2 Current
Plate Voltage
250 volts
Plate Voltage 125 250 volts
Grid-No
150 volts
Grid-No.2 (Screen-Grid) Voltage - 150 volts
Cathode Current
18
Cathode Current 16 18
Plate Voltage
170 volts
Plate Voltage 100 170 volts
Grid-No
160 volts
Grid-No.2 Voltage - 160 volts
Voltage
-1.2 volts
Voltage -3 -1.2 volts
Amplification Factor
17
Amplification Factor 17 -

SECTION 2

Pentode

Capacitance

Grid No.l to Plate
0.1 pF
Grid No.l to Plate 0.1 max pF
Triode Grid to Pentode Plate
0.016 pF
Triode Grid to Pentode Plate 0.016 max pF

Other

Grid No.l to Cathode, Heater, Grid No
3
Grid No.l to Cathode, Heater, Grid No.2, Grid No.3,
Plate to Cathode, Heater, Grid No
3
Plate to Cathode, Heater, Grid No.2, Grid No.3,
Peak Heater-Cathode Voltage ±
100 volts
Peak Heater-Cathode Voltage ±100 max ±100 max ±100 max volts