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8AU8A

Television triode-pentode for video/IF amplification and synchronization or sweep service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9DX
Socket code: B9A
Base pins: 9
Nominal heater: 8.4 V / 450 mA

Description

The 8AU8A combines a sharp-cutoff pentode with a medium-mu triode for series-heater television receivers; the pentode suits video/IF service and the triode sync, clipper or sweep-oscillator functions.

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: 8.4 V
Nominal heater current: 450 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

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6100 Ω
Transconductance: 0.0049 S
Amplification factor: 40
Max plate voltage: 300 V
Max plate dissipation: 1.5 W

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

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate_voltage
200 V
VideoAmplifier
Screen_voltage
125 V
VideoAmplifier
Cathode_bias_resistor
82 ohm
VideoAmplifier

Characteristic

Plate_current
15 mA
VideoAmplifier
Screen_current
3.4 mA
VideoAmplifier
Transconductance
7000 uS
VideoAmplifier

Capacitance

Grid-to-plate capacitance
0.06 pF
Input capacitance
7.5 pF
Output capacitance
3.4 pF

SECTION 2

Triode

Other

Plate_voltage
150 V
SyncAmplifier
Cathode_bias_resistor
150 ohm
SyncAmplifier
Heater_warmup_time
11 s
SyncAmplifier

Characteristic

Plate_current
9 mA
SyncAmplifier
Amplification_factor
40
SyncAmplifier
Plate_resistance
6100 ohm
SyncAmplifier
Transconductance
4900 uS
SyncAmplifier

Capacitance

Grid-to-plate capacitance
2.2 pF
Input capacitance
2.6 pF
Output capacitance
0.34 pF