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Voltage Radio Detector Converter ·Pentode-Triode

6BH8

Sharp-cutoff pentode and medium-mu triode designed for television frequency-changing and amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9DX
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 600 mA

Description

Sharp-cutoff pentode and medium-mu triode for television frequency-changing and amplifier 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: 600 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 150000 Ω
Transconductance: 0.007 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 3 W
Max screen dissipation: 1 W

Triode-pentode combination for television amplifier/oscillator service.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5150 Ω
Transconductance: 0.0033 S
Amplification factor: 17
Max plate voltage: 300 V
Max plate dissipation: 2.5 W

Triode-pentode combination for television amplifier/oscillator service.

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

Pentode

Other

Plate Voltage
200 V
ClassA;PentodeSection
Screen Voltage
125 V
ClassA;PentodeSection

Characteristic

Plate Current
15 mA
ClassA;PentodeSection

SECTION 2

Triode

Other

Plate Voltage
150 V
ClassA;TriodeSection
Heater Warmup Time
11 s

Characteristic

Plate Current
9.5 mA
ClassA;TriodeSection

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Heater current
600 mA

Other

Maximum plate voltage
300 V
Maximum screen supply voltage
300 V
Maximum plate dissipation
3 W
Maximum screen dissipation
1 W

SECTION 2

Triode

Characteristics

Heater voltage
6.3 V
Heater current
600 mA

Other

Maximum plate voltage
300 V
Maximum plate dissipation
2.5 W

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

PENTODE GRID #
0.004 W
Capacitances | PENTODE GRID #1 TO TRIODE PLATE 0.004 w~f

Other

HEATER VOLTAGE (
7.3 V
Maximum Ratings | HEATER VOLTAGE (7.3 VOLT$
MAXIMUM PLATE DISSIPATION ~.Q
2.5 W
Maximum Ratings | MAXIMUM PLATE DISSIPATION ~.Q 2.5 WATTS
HEATER VOLTAGE (
3 V
Typical Operating Conditions | HEATER VOLTAGE (.3 VOLT$
PLATE RESiSTA NCE (A PPROX.)
150 ohm
Typical Operating Conditions | PLATE RESiSTA NCE (A PPROX.) 1)FQ_000 S 150 OHMS
PLATE CURRENT l.~j
9.5 mA
Typical Operating Conditions | PLATE CURRENT l.~j 9.5 MA.

Characteristic

GRID #
2 V
Pentode Section | GRID #2 VOLTS

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Screen Supply Voltage
300 V
Heater Warmup Time
11 s

Characteristic

Plate Voltage
200 V
ClassA
Screen Voltage
125 V
ClassA
Cathode Bias Resistance
82 ohm
ClassA
Plate Current
15 mA
ClassA
Screen Current
3.4 mA
ClassA
Grid1VoltageAtPlateCurrent100uA
-8 V
ClassA

Capacitance

Grid1 To Plate Capacitance
0.046 pF
Input Capacitance
7 pF
Output Capacitance
2.4 pF

SECTION 2

Triode

Characteristic

Plate Voltage
150 V
ClassA
Grid Voltage
-5 V
ClassA
Plate Current
9.5 mA
ClassA
GridVoltageAtPlateCurrent100uA
-14 V
ClassA

Capacitance

Grid To Plate Capacitance
2.4 pF
Input Capacitance
2.6 pF
Output Capacitance
0.38 pF