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Voltage Radio Detector Converter ·Pentode-Triode

6AT8A

Medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in television receivers with approximately 40 MHz IF.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in television receivers with about 40-MHz IF.

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: 9DW
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

9DW - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN22P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN3K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN4H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN5H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN61P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN71G2	A	G2 — Screen Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN81G3	A	G3 — Suppressor Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW
PIN91G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DW

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 300000 Ω
Transconductance: 0.0055 S
Max plate voltage: 275 V
Max screen voltage: 300 V
Max plate dissipation: 2.3 W
Max screen dissipation: 0.65 W

Reference-only sheet states electrical ratings same as 6X8 except listed heater/capacitance differences; no unsupported promoted values guessed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6000 Ω
Transconductance: 0.0065 S
Amplification factor: 40
Max plate voltage: 275 V
Max plate dissipation: 1.7 W

Reference-only sheet states electrical ratings same as 6X8 except listed heater/capacitance differences; no unsupported promoted values guessed.

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

Heater voltage
6.3 V
Heater current
450 mA
Plate voltage
150 V
ClassA1
Transconductance
5500 uS
ClassA1

Capacitance

Pentode grid to plate
0.06 pF

SECTION 2

Triode

Other

Plate voltage
150 V
ClassA1
Transconductance
6500 uS
ClassA1

Capacitance

Triode grid to plate
1.5 pF

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
125 V
PentodeUnit
Screen Voltage
125 V
PentodeUnit
Plate Current
10 mA
PentodeUnit
Screen Current
3.5 mA
PentodeUnit

Characteristic

Transconductance
6500 uS
GridToPlateCapacitanceMaximum
0.015 pF
Input Capacitance
5 pF
Output Capacitance
3.5 pF

SECTION 2

Triode

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
450 mA
ControlledWarmupHeater
1 boolean
Heater Warmup Time
11 s
Transconductance
5500 uS
Amplification Factor
40
Grid To Plate Capacitance
2 pF
Input Capacitance
3 pF
Output Capacitance
2 pF

Other

Plate Voltage
125 V
TriodeUnit
Plate Current
10 mA
TriodeUnit

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater voltage
6.3 V
Published table
Heater current
450 mA
Published table
Pentode transconductance
5500 µS
PentodeSection
Pentode plate resistance
300000 ohm
PentodeSection
Triode transconductance
6500 µS
TriodeSection
Triode plate resistance
6000 ohm
TriodeSection
Triode amplification factor
40
TriodeSection

Other

Pentode plate voltage
125 V
PentodeSection
Pentode plate current
9 mA
PentodeSection
Triode plate voltage
125 V
TriodeSection
Triode plate current
12 mA
TriodeSection

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage nominal
6.3 V
Heater current
450 mA
Source-stated electrical equivalence
Same as 6X8 except listed heater and capacitance items
ReferenceOnly

Characteristics

Heater warm-up time
11 s
Average

Capacitance

Grid No.1-to-plate capacitance
0.03 pF
WithExternalShield
Input capacitance
4.8 pF
WithExternalShield
Output capacitance
1.6 pF
WithExternalShield

SECTION 2

Triode

Other

Heater voltage nominal
6.3 V
Heater current
450 mA
Source-stated electrical equivalence
Same as 6X8 except listed heater and capacitance items
ReferenceOnly

Characteristics

Heater warm-up time
11 s
Average

Capacitance

Grid-to-plate capacitance
1.5 pF
WithExternalShield
Grid-to-cathode-and-heater capacitance
2.4 pF
WithExternalShield
Plate-to-cathode-and-heater capacitance
1 pF
WithExternalShield

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

frequency in the order of
40 MHz
Published in approved 6AT8A target entry; Section2
Heater Warm-up Time ( Average) 11
11 seconds
Published in approved 6AT8A target entry; Section2
Heater Voltage (ac/dc)
6.3 V
Published in approved 6AT8A target entry; Section2
Heater Current
1.8 A
Published in approved 6AT8A target entry; Section2
Peak Inverse Plate Voltage#
4500 V
Published in approved 6AT8A target entry; Section2
Peak Plate Current
1300 mA
Published in approved 6AT8A target entry; Section2
Average Plate Current
210 mA
Published in approved 6AT8A target entry; Section2
Plate Dissipation
6.5 W
Published in approved 6AT8A target entry; Section2
Peak value +300
-4500 V
Published in approved 6AT8A target entry; Section2
Average value -(-100
-900 V
Published in approved 6AT8A target entry; Section2

Capacitance

Heater Voltage (ac/dc) 4.7
6.3 V
Published in approved 6AT8A target entry; Section2
Heater Current , . . 0.6
450 mA
Published in approved 6AT8A target entry; Section2
Grid to Plate 1.5
1.5 pF
Published in approved 6AT8A target entry; Section2
Grid to Cathode and Heater 2
2.4 pF
Published in approved 6AT8A target entry; Section2
Plate to Cathode and Heater 0.5
1 pF
Published in approved 6AT8A target entry; Section2
Grid No.3 4.6
4.8 pF
Published in approved 6AT8A target entry; Section2
Grid No.3 0.9
1.6 pF
Published in approved 6AT8A target entry; Section2
Plate to Heater and Cathode
8.5 pF
Published in approved 6AT8A target entry; Section2
Cathode to Heater and Plate
11.5 pF
Published in approved 6AT8A target entry; Section2
Heater to Cathode
4 pF
Published in approved 6AT8A target entry; Section2

SECTION 2

Triode

Other

frequency in the order of
40 MHz
Published in approved 6AT8A target entry; Section1
Heater Warm-up Time ( Average) 11
11 seconds
Published in approved 6AT8A target entry; Section1
Heater Voltage (ac/dc)
6.3 V
Published in approved 6AT8A target entry; Section1
Heater Current
1.8 A
Published in approved 6AT8A target entry; Section1
Peak Inverse Plate Voltage#
4500 V
Published in approved 6AT8A target entry; Section1
Peak Plate Current
1300 mA
Published in approved 6AT8A target entry; Section1
Average Plate Current
210 mA
Published in approved 6AT8A target entry; Section1
Plate Dissipation
6.5 W
Published in approved 6AT8A target entry; Section1
Peak value +300
-4500 V
Published in approved 6AT8A target entry; Section1
Average value -(-100
-900 V
Published in approved 6AT8A target entry; Section1

Capacitance

Heater Voltage (ac/dc) 4.7
6.3 V
Published in approved 6AT8A target entry; Section1
Heater Current , . . 0.6
450 mA
Published in approved 6AT8A target entry; Section1
Grid to Plate 1.5
1.5 pF
Published in approved 6AT8A target entry; Section1
Grid to Cathode and Heater 2
2.4 pF
Published in approved 6AT8A target entry; Section1
Plate to Cathode and Heater 0.5
1 pF
Published in approved 6AT8A target entry; Section1
Grid No.3 4.6
4.8 pF
Published in approved 6AT8A target entry; Section1
Grid No.3 0.9
1.6 pF
Published in approved 6AT8A target entry; Section1
Plate to Heater and Cathode
8.5 pF
Published in approved 6AT8A target entry; Section1
Cathode to Heater and Plate
11.5 pF
Published in approved 6AT8A target entry; Section1
Heater to Cathode
4 pF
Published in approved 6AT8A target entry; Section1