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Voltage Radio Detector Converter ·Pentode-Triode

5FV8

Medium-mu triode and sharp-cutoff pentode used together as oscillator and mixer in VHF television tuners.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Reference/equivalence entry for a medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in VHF television tuners.

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: 9FA
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

9FA - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	B	G1 — Control Grid Original chart label: 2G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN2Base Pin	B	P — Plate (Anode) Original chart label: 2P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN3Base Pin	B	K — Cathode Original chart label: 2K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN4Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN5Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN6Base Pin	A	P — Plate (Anode) Original chart label: 1P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN7Base Pin	A	G2 — Screen Grid Original chart label: 1G2; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN8Base Pin	A	G3 — Suppressor GridGroup 9FA8 Original chart label: 1G3; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN8Base Pin	A	K — CathodeGroup 9FA8 Original chart label: 1K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA
PIN8Base Pin	—	IS — Internal ScreenGroup 9FA8 Original chart label: IS; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FA

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.008 S
Amplification factor: 40
Max plate voltage: 330 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

Electrical characteristics cloned from explicit counterpart 6FV8; heater replaced by 5FV8 source values. Triode vertical-deflection oscillator section.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.0065 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 2.3 W
Max screen dissipation: 0.55 W

Electrical characteristics cloned from explicit counterpart 6FV8; heater replaced by 5FV8 source values. Pentode general-purpose/IF amplifier 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
4.7 V
Heater current
600 mA

SECTION 2

Pentode

Other

Heater voltage
4.7 V
Heater current
600 mA

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Triode typical plate voltage
125 V
Heater-cathode voltage maximum
200 V

Characteristics

Triode transconductance
8000 uS
Triode amplification factor
40
Triode plate resistance
5000 ohm
Heater warm-up time
11 s

Application

Application
Oscillator / phase inverter / vertical oscillator

SECTION 2

Pentode

Other

Pentode/tetrode typical plate voltage
125 V
Pentode/tetrode grid2 voltage
125 V

Characteristics

Pentode/tetrode transconductance
6000 uS
Pentode/tetrode plate resistance
300000 ohm

Application

Application
Mixer / IF / video / general-purpose amplifier

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
125 V
TriodeSection
Grid voltage
-1 V
TriodeSection
Plate current
14 mA
TriodeSection

Characteristic

Transconductance
8000 uS
TriodeSection
Amplification factor
40
TriodeSection
Plate resistance
5 kOhm
TriodeSection

Capacitance

Grid-to-plate capacitance
1.8 pF
TriodeSection

SECTION 2

Pentode

Other

Maximum screen supply voltage
330 V
PentodeSection
Plate voltage
125 V
PentodeSection
Screen voltage
125 V
PentodeSection
Grid voltage
-1 V
PentodeSection
Plate current
12 mA
PentodeSection
Screen current
4 mA
PentodeSection

Characteristic

Transconductance
9500 uS
PentodeSection
Plate resistance
200 kOhm
PentodeSection

Capacitance

Grid-to-plate capacitance
- to 0.01 pF
PentodeSection; WithShield; Maximum

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
1.8 pF
Triode;WithoutShield
Input capacitance
2.8 pF
Triode;WithoutShield
Output capacitance
1.5 pF
Triode;WithoutShield

Other

Peak negative pulse grid voltage
250 V
VerticalDeflection
Peak cathode current
70 mA
VerticalDeflection
Plate voltage
125 V
Typical
Grid #1 voltage
-1 V
Typical
Plate current
14 mA
Typical
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
Pentode;WithoutShield
Input capacitance
5 pF
Pentode;WithoutShield
Output capacitance
2 pF
Pentode;WithoutShield

Other

Plate voltage
125 V
Typical
Screen voltage
125 V
Typical
Grid #1 voltage
-1 V
Typical
Plate current
12 mA
Typical
Screen current
4 mA
Typical