Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Service
Vertical deflection oscillator
SECTION 2
Pentode
Other
Service
General-purpose or IF amplifier
Voltage Radio Detector Converter ·Pentode-Triode
6FV8A
Medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in VHF television tuners.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9FA
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 450 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
- 6.3 V
- Nominal heater current
- 450 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
- 5600 Ω
- Transconductance
- 0.008 S
- Amplification factor
- 45
- Max plate voltage
- 330 V
- Max plate dissipation
- 2.3 W
- Max cathode current
- 20 mA
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
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 02
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Plate resistance
5600 ohm
Transconductance
8000 uS
Amplification factor
45
Other
Maximum plate voltage
330 V
Maximum plate dissipation
2.3 W
Heater voltage
6.3 V
Heater current
450 mA
Typical plate voltage
125 V
Typical plate current
12 mA
SECTION 2
Pentode
Characteristic
Plate resistance
200000 ohm
Transconductance
6500 uS
Other
Maximum plate voltage
330 V
Maximum plate dissipation
2.3 W
Maximum screen-grid dissipation
0.55 W
Heater voltage
6.3 V
Heater current
450 mA
Typical plate voltage
125 V
Typical screen-grid voltage
125 V
Typical plate current
12 mA
Data set 03
1966 Tung Sol Electronic Tubes 2 of 4
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
12 mA
Typical
Heater warm-up time
11 s
BothSections
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