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5GH8A

Combined medium-mu triode and sharp-cutoff pentode for television horizontal oscillator, multivibrator, frequency-control, and related amplifier circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9AE
Socket code: B9A
Base pins: 9
Nominal heater: 4.7 V / 600 mA

Description

Medium-mu triode and sharp-cutoff pentode for television horizontal-oscillator, multivibrator, and amplifier applications. Explicit heater variant/co-designation of 9GH8A in the approved source.

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: 4.7 V
Nominal heater current: 600 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

Electrical characteristics cloned from explicit counterpart 6GH8A; heater replaced by 5GH8A source values. Medium-mu triode unit.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.0075 S
Max plate voltage: 350 V
Max screen voltage: 330 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.55 W
Max cathode current: 20 mA

Electrical characteristics cloned from explicit counterpart 6GH8A; heater replaced by 5GH8A source values. Sharp-cutoff pentode horizontal-oscillator unit.

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 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
1.7 pF
WithoutShield
Input capacitance
3 pF
WithoutShield
Output capacitance
1.4 pF
WithoutShield

Other

Plate voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
13.5 mA
ClassA
Heater/filament voltage
4.7 V
DerivativeSheet
Heater/filament current
600 mA
DerivativeSheet
Heater warm-up time
11 s
ControlledWarmup

SECTION 2

Pentode

Capacitance

Grid #1-to-plate capacitance
0.02 pF
WithoutShield
Input capacitance
5 pF
WithoutShield
Output capacitance
2.6 pF
WithoutShield

Other

Plate voltage
125 V
ClassA
Screen voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
12 mA
ClassA
Screen current
4 mA
ClassA
Peak negative grid #1 voltage
175 V
HorizontalDeflectionOscillator
Peak cathode current
330 mA
HorizontalDeflectionOscillator

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Warm-up Time (Average)
11 s
Other;PublishedValue1
Heater Warm-up Time (Average)
11 s
Other;PublishedValue2
Peak value
200 V
Other;PublishedValue1
Peak value
200 V
Other;PublishedValue2
Peak value
200 V
Other;PublishedValue3
Average value
100 V
Other;PublishedValue1
Average value
100 V
Other;PublishedValue2
Average value
100 V
Other;PublishedValue3
Plate Voltage
330 V
MaximumRating;PublishedValue1
Plate Voltage
350 V
MaximumRating;PublishedValue2
Grid-No
2 V
MaximumRating;PublishedValue1
Grid-No
330 V
MaximumRating;PublishedValue2
Peak Cathode Current —
300 mA
MaximumRating
Average Cathode Current —
20 mA
MaximumRating
Plate Dissipation
2.5 W
MaximumRating;PublishedValue1
Plate Dissipation
2.5 W
MaximumRating;PublishedValue2
Grid-No
2 W
MaximumRating;PublishedValue1
Grid-No
0.55 W
MaximumRating;PublishedValue2
Maximum Plate Voltage
330 V
Section1
Maximum Plate Dissipation
2.5 W
Section1

Capacitance

Grid to Plate
1.7 pF
Capacitance
Pentode Cathode, and Internal Shield
3 pF
Capacitance;PublishedValue1
Pentode Cathode, and Internal Shield
3.2 pF
Capacitance;PublishedValue2
Pentode Cathode, and Internal Shield
1.4 pF
Capacitance;PublishedValue1
Pentode Cathode, and Internal Shield
1.9 pF
Capacitance;PublishedValue2
Heater to Cathode
3 pF
Capacitance
Grid No.l to Plate
0.02 pF
Capacitance;PublishedValue1
Grid No.l to Plate
0.01 pF
Capacitance;PublishedValue2
Grid No
3 pF
Capacitance;PublishedValue1
Grid No
5 pF
Capacitance;PublishedValue2
and Internal Shield
2.6 pF
Capacitance
Heater to Cathode, Grid No
3 pF
Capacitance;PublishedValue1
Heater to Cathode, Grid No
3 pF
Capacitance;PublishedValue2

Characteristic

Plate Voltage
125 V
Characteristic;PublishedValue1
Plate Voltage
125 V
Characteristic;PublishedValue2
Grid-No
2 V
Characteristic;PublishedValue1
Grid-No
125 V
Characteristic;PublishedValue2
Grid-No
1 V
Characteristic;PublishedValue1
Grid-No
-1 V
Characteristic;PublishedValue2
Grid-No
-1 V
Characteristic;PublishedValue3
Plate Resistance (Approx.)
5400 ohm
Characteristic;PublishedValue1
Plate Resistance (Approx.)
200000 ohm
Characteristic;PublishedValue2
Plate Current
13.5 mA
Characteristic;PublishedValue1
Plate Current
12 mA
Characteristic;PublishedValue2
Grid-No
2 mA
Characteristic;PublishedValue1
Grid-No
4 mA
Characteristic;PublishedValue2
Grid-No.l Voltage (Approx.) for olate current of
10 uA
Characteristic;PublishedValue1
Grid-No.l Voltage (Approx.) for olate current of
-8 uA
Characteristic;PublishedValue2
Grid-No.l Voltage (Approx.) for olate current of
-8 uA
Characteristic;PublishedValue3
Plate Resistance
5400 ohm
Section1
Transconductance
8500 uS
Section1
Amplification Factor
46
Section1

SECTION 2

Pentode

Other

Maximum Plate Voltage
350 V
Section2
Maximum Plate Dissipation
2.5 W
Section2

Characteristic

Plate Resistance
200000 ohm
Section2
Transconductance
7500 uS
Section2