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Power - Pentode (NOT beam) ·Pentode-Triode

11LQ8

Miniature triode-pentode for television receivers. The triode serves sync-separator or sound-IF functions while the pentode provides video-output amplification, combining control and output stages in one tube.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9DX
Socket code: B9A
Base pins: 9
Nominal heater: 10.9 V / 450 mA

Description

Miniature triode-pentode used in television receivers, with the triode serving sync-separator/sound-IF functions and the pentode serving video output.

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: 10.9 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 4400 Ω
Transconductance: 0.0104 S
Amplification factor: 35
Max plate voltage: 300 V
Max plate dissipation: 2 W

medium-mu

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 75000 Ω
Transconductance: 0.023 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 5 W
Max screen dissipation: 1 W

sharp-cutoff

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

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum Plate Voltage
300 V
Inherited from explicitly referenced 6-volt parent type
Plate Dissipation
2 W
Inherited from explicitly referenced 6-volt parent type

Characteristics

Plate Resistance
4400 Ω
Transconductance
10400 µS

SECTION 2

Pentode

Other

Maximum Plate Voltage
300 V
Inherited from explicitly referenced 6-volt parent type
Plate Dissipation
5 W
Inherited from explicitly referenced 6-volt parent type

Characteristics

Plate Resistance
75000 Ω
Transconductance
23000 µS
Screen Supply Voltage
125 V

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid to Plate
2.8 pF
Grid to other electrodes
4.2 pF
Plate to other electrodes
2.4 pF

Other

Plate supply voltage
125 V
ClassA
Cathode-bias resistor
68 ohm
ClassA
Plate current
15 mA
ClassA

SECTION 2

Pentode

Capacitance

Grid No.1 to Plate
0.12 pF
Grid No.1 to other electrodes
14 pF
Plate to other electrodes
4.8 pF

Other

Plate supply voltage
125 V
ClassA
Screen-grid supply voltage
125 V
ClassA
Cathode-bias resistor
82 ohm
ClassA
Plate current
16.5 mA
ClassA
Screen-grid current
3.1 mA
ClassA