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Voltage Pentode or Tetrode (with diode) ·Diode-Pentode

6AS8

High-perveance diode and sharp-cutoff pentode for television or radio IF, video, AGC, detector, and DC-restorer applications.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Combination high-perveance diode and sharp-cutoff pentode for television/radio IF, video, AGC, detector, and DC-restorer applications.

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: 9AK
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

9AK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN11G3	A	G3 — Suppressor Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN22G1	B	G1 — Control Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN32P	B	P — Plate (Anode) EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN4H	—	H — Heater EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN5H	—	H — Heater EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN6K	A	K — Cathode EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN71G1	A	G1 — Control Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN81G2	A	G2 — Screen Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK
PIN91P	A	P — Plate (Anode) EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AK

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 300000 Ω
Transconductance: 0.0062 S
Max plate voltage: 200 V
Max screen voltage: 330 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.5 W

Sharp-cutoff pentode; promoted Class A1 values.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 5 mA
Rectifier peak inverse voltage: 330 V
Rectifier nominal output current: 5 A
Rectifier peak forward current: 50 A

Diode detector section.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
200 V
ClassA
Screen voltage
150 V
ClassA
Plate current
9.5 mA
ClassA
Screen current
3 mA
ClassA

SECTION 2

Diode

Other

Plate voltage
200 V
ClassA
Screen voltage
150 V
ClassA
Plate current
9.5 mA
ClassA
Screen current
3 mA
ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Plate voltage
150 V
ClassA1
Transconductance
6200 uS
ClassA1

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 2

Diode

Characteristic

Heater voltage
6.3 V
Published table
Heater current
450 mA
Published table
Pentode plate resistance
300000 ohm
PentodeSection
Pentode transconductance
6000 µS
PentodeSection

Other

Diode peak inverse plate voltage
330 V
DiodeSection
Diode peak plate current
50 mA
DiodeSection
Diode DC plate current
5 mA
DiodeSection

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

Characteristics

Plate supply voltage
200 V
ClassA1
Screen supply voltage
150 V
ClassA1
Cathode resistor
180 ohm
ClassA1
Plate resistance
300000 ohm
ClassA1
Transconductance
6200 µS
ClassA1
Plate current
9.5 mA
ClassA1
Screen current
3 mA
ClassA1
Grid voltage for plate current 10 µA
-8 V
ClassA1

Capacitance

Grid No.1-to-plate capacitance
0.04 pF
Input capacitance
7 pF
Output capacitance
2.2 pF

SECTION 2

Diode

Other

Heater voltage nominal
6.3 V
Heater current
450 mA
Maximum DC plate current
5 mA

Capacitance

Plate-to-heater/cathode/internal-shield capacitance
3 pF

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater Voltage (ac/dc)
6.3 V
Published in approved 6AS8 target entry; Section2
Heater Current
450 mA
Published in approved 6AS8 target entry; Section2
Internal Shield
3 pF
Published in approved 6AS8 target entry; Section2
Grid No.l to Plate
0.03 pF
Published in approved 6AS8 target entry; Section2
Grid-No.2 Supply Voltage
150 V
Published in approved 6AS8 target entry; Section2
Cathode-Bias Resistor
180 Ω
Published in approved 6AS8 target entry; Section2
Transconductance
6200 µS
Published in approved 6AS8 target entry; Section2
Plate Current
9.5 mA
Published in approved 6AS8 target entry; Section2
Grid-No.2 Current
3 mA
Published in approved 6AS8 target entry; Section2
Grid-No.l Voltage (Approx.) for plate current of 10 /iA
-8 V
Published in approved 6AS8 target entry; Section2

Capacitance

Internal Shield
7 pF
Published in approved 6AS8 target entry; Section2
Internal Shield
2.4 pF
Published in approved 6AS8 target entry; Section2

Other

Plate Voltage
300 V
Published in approved 6AS8 target entry; Section2
Grid-No. 3 (Suppressor-Grid) Voltage, Positive value
0 V
Published in approved 6AS8 target entry; Section2
Grid-No. 2 Supply Voltage
300 V
Published in approved 6AS8 target entry; Section2
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 6AS8 target entry; Section2
Plate Dissipation
2.5 W
Published in approved 6AS8 target entry; Section2
For grid-No.2 voltages up to
150 V
Published in approved 6AS8 target entry; Section2
For grid-No.2 voltages up to 150 volts
0.5 W
Published in approved 6AS8 target entry; Section2
For grid-No.2 voltages between 150 and
300 V
Published in approved 6AS8 target entry; Section2
Plate Supply Voltage
200 V
Published in approved 6AS8 target entry; Section2
For fixed-bias operation
0.25 MΩ
Published in approved 6AS8 target entry; Section2
For cathode-bias operation
1 MΩ
Published in approved 6AS8 target entry; Section2
Peak Inverse Plate Voltage
330 V
Published in approved 6AS8 target entry; Section2
Peak Plate Current
50 mA
Published in approved 6AS8 target entry; Section2
Average Plate Current
5 mA
Published in approved 6AS8 target entry; Section2
Heater Voltage (ac/dc) 6.3
12.6 V
Published in approved 6AS8 target entry; Section2
Heater Current 0.3
150 mA
Published in approved 6AS8 target entry; Section2
Triode Grid to Triode Plate
2 pF
Published in approved 6AS8 target entry; Section2
Triode Grid to Cathode and Heater
2.2 pF
Published in approved 6AS8 target entry; Section2
Triode Plate to Cathode and Heater
0.8 pF
Published in approved 6AS8 target entry; Section2
Plate Dissipation
0.5 W
Published in approved 6AS8 target entry; Section2
Grid Voltage, Positive-bias value
0 V
Published in approved 6AS8 target entry; Section2
Plate Voltage 100
250 V
Published in approved 6AS8 target entry; Section2
Grid Voltage —1
-3 V
Published in approved 6AS8 target entry; Section2
Plate Resistance 54000
58000 Ω
Published in approved 6AS8 target entry; Section2
Transconductance 1300
1200 µS
Published in approved 6AS8 target entry; Section2
Plate Current 0.8
1 mA
Published in approved 6AS8 target entry; Section2
frequency in the order of
40 MHz
Published in approved 6AS8 target entry; Section2

SECTION 2

Diode

Characteristic

Heater Voltage (ac/dc)
6.3 V
Published in approved 6AS8 target entry; Section1
Heater Current
450 mA
Published in approved 6AS8 target entry; Section1
Internal Shield
3 pF
Published in approved 6AS8 target entry; Section1
Grid No.l to Plate
0.03 pF
Published in approved 6AS8 target entry; Section1
Grid-No.2 Supply Voltage
150 V
Published in approved 6AS8 target entry; Section1
Cathode-Bias Resistor
180 Ω
Published in approved 6AS8 target entry; Section1
Transconductance
6200 µS
Published in approved 6AS8 target entry; Section1
Plate Current
9.5 mA
Published in approved 6AS8 target entry; Section1
Grid-No.2 Current
3 mA
Published in approved 6AS8 target entry; Section1
Grid-No.l Voltage (Approx.) for plate current of 10 /iA
-8 V
Published in approved 6AS8 target entry; Section1

Capacitance

Internal Shield
7 pF
Published in approved 6AS8 target entry; Section1
Internal Shield
2.4 pF
Published in approved 6AS8 target entry; Section1

Other

Plate Voltage
300 V
Published in approved 6AS8 target entry; Section1
Grid-No. 3 (Suppressor-Grid) Voltage, Positive value
0 V
Published in approved 6AS8 target entry; Section1
Grid-No. 2 Supply Voltage
300 V
Published in approved 6AS8 target entry; Section1
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 6AS8 target entry; Section1
Plate Dissipation
2.5 W
Published in approved 6AS8 target entry; Section1
For grid-No.2 voltages up to
150 V
Published in approved 6AS8 target entry; Section1
For grid-No.2 voltages up to 150 volts
0.5 W
Published in approved 6AS8 target entry; Section1
For grid-No.2 voltages between 150 and
300 V
Published in approved 6AS8 target entry; Section1
Plate Supply Voltage
200 V
Published in approved 6AS8 target entry; Section1
For fixed-bias operation
0.25 MΩ
Published in approved 6AS8 target entry; Section1
For cathode-bias operation
1 MΩ
Published in approved 6AS8 target entry; Section1
Peak Inverse Plate Voltage
330 V
Published in approved 6AS8 target entry; Section1
Peak Plate Current
50 mA
Published in approved 6AS8 target entry; Section1
Average Plate Current
5 mA
Published in approved 6AS8 target entry; Section1
Heater Voltage (ac/dc) 6.3
12.6 V
Published in approved 6AS8 target entry; Section1
Heater Current 0.3
150 mA
Published in approved 6AS8 target entry; Section1
Triode Grid to Triode Plate
2 pF
Published in approved 6AS8 target entry; Section1
Triode Grid to Cathode and Heater
2.2 pF
Published in approved 6AS8 target entry; Section1
Triode Plate to Cathode and Heater
0.8 pF
Published in approved 6AS8 target entry; Section1
Plate Dissipation
0.5 W
Published in approved 6AS8 target entry; Section1
Grid Voltage, Positive-bias value
0 V
Published in approved 6AS8 target entry; Section1
Plate Voltage 100
250 V
Published in approved 6AS8 target entry; Section1
Grid Voltage —1
-3 V
Published in approved 6AS8 target entry; Section1
Plate Resistance 54000
58000 Ω
Published in approved 6AS8 target entry; Section1
Transconductance 1300
1200 µS
Published in approved 6AS8 target entry; Section1
Plate Current 0.8
1 mA
Published in approved 6AS8 target entry; Section1
frequency in the order of
40 MHz
Published in approved 6AS8 target entry; Section1