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6LM8

Medium-mu triode and semi-remote-cutoff pentode for television burst amplification and general-purpose amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Medium-mu triode and semi-remote-cutoff pentode for television receivers; pentode is used as a burst amplifier and triode as a general-purpose amplifier.

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: 9AE
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

9AE - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN21G1	A	G1 — Control Grid Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN31G2	A	G2 — Screen Grid Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN4H	—	H — Heater Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN5H	—	H — Heater Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN61P	A	P — Plate (Anode) Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN71G3	A	G3 — Suppressor GridGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN7IS	A	IS — Internal ScreenGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN71K	A	K — CathodeGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN82K	B	K — Cathode Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN92G1	B	G1 — Control Grid Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5400 Ω
Transconductance: 0.0085 S
Amplification factor: 46
Max plate voltage: 330 V
Max plate dissipation: 2.5 W

Published promoted values applied where applicable; additional ratings, characteristics, and operating data retained as parameters.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 150000 Ω
Transconductance: 0.006 S
Max plate voltage: 350 V
Max screen voltage: 330 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.55 W

Published promoted values applied where applicable; additional ratings, characteristics, and operating data retained as parameters.

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

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
450 mA
Plate Voltage
125 V
Grid Voltage
-1 V
Plate Current
13.5 mA
Amplification Factor
46
Plate Resistance
5400 ohm
Transconductance
8500 uS
Grid To Plate Capacitance
1.8 pF
Input Capacitance
3.2 pF
Output Capacitance
1.9 pF

SECTION 2

Pentode

Characteristic

Plate Voltage
125 V
Screen Voltage
125 V
Grid Voltage
-2 V
Plate Current
12 mA
Screen Current
4 mA
Plate Resistance
150000 ohm
Transconductance
6000 uS
Grid To Plate Capacitance
0.015 pF
Input Capacitance
5.5 pF
Output Capacitance
3.8 pF

Data set 02

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Voltage (~C or DC) — published value 1
6.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Voltage (~C or DC) — published value 2
0.6 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current at heater volts = 6.3 — published value 1
6.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current at heater volts = 6.3 — published value 2
0.45 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid to plate
1.8 pF
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater to cathode (Each unit)
3.2 pF
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 1 -Triode Plate
1
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 3 -Pent age Grid No.2
3
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 9-Tr:o;~~ Grid
9
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage — published value 1
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage — published value 2
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.2 Voltage
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.1 Voltage — published value 1
-1 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.1 Voltage — published value 2
-2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Resistance (Approx.) — published value 1
5400 ohm
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Resistance (Approx.) — published value 2
150000 ohm
Published datasheet value; multiple values represent separate source-table limits or conditions.
Transconductance — published value 1
8500
Published datasheet value; multiple values represent separate source-table limits or conditions.
Transconductance — published value 2
6000
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Current — published value 1
1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Current — published value 2
12 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.2 Current
4 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
for plate µa = 10 — published value 1
10 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
for plate µa = 10 — published value 2
-8 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
for plate µa = 10 — published value 3
-14 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID—No.2 VOLTS = 125
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE (Iy) OR GRID-Na2 (I~2) MILLIAMPERES
2 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE VOLTS = 125
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID -No. 2 VOLTS = 125 — published value 1
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID -No. 2 VOLTS = 125 — published value 2
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.

Other

Heater negative v,ithre_p=cttocathode
200 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater positive with respect to cathode
200 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.1 to plate
0.015 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage — published value 1
330 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage — published value 2
350 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Supply Voltage
330 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Positive-bias value — published value 1
0 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Positive-bias value — published value 2
0 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Dissipation — published value 1
2 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Dissipation — published value 2
5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Dissipation — published value 3
2.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For fixed-bias operation, — published value 1
0.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For fixed-bias operation, — published value 2
0.25 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For cathode-bias operation — published value 1
1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For cathode-bias operation — published value 2
0.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.

SECTION 2

Pentode

Characteristics

Pin 2 - Pentode Grid No.1
2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 6 -Pentode Plate
6
Published datasheet value; multiple values represent separate source-table limits or conditions.
Fin 7 -Pentode Cathode,
7
Published datasheet value; multiple values represent separate source-table limits or conditions.

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Voltage
6.3 V
Nominal
Heater Current
450 mA
Nominal
Plate Voltage
125 V
ClassA
Control Grid Voltage
-1 V
ClassA
Plate Current
13.5 mA
ClassA

Capacitance

Grid-to-Plate Capacitance
1.8 pF
Grid Input Capacitance
3.2 pF

SECTION 2

Pentode

Capacitance

Grid No.1-to-Plate Capacitance
0.015 pF
Grid No.1 Input Capacitance
5.5 pF
Plate Output Capacitance
3.8 pF

Other

Plate Voltage
125 V
ClassA
Screen Voltage
125 V
ClassA
Control Grid Voltage
-2 V
ClassA
Plate Current
12 mA
ClassA
Screen Current
4 mA
ClassA