Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Application
Service
Video amplifier
SECTION 2
Pentode
Application
Service
Burst amplifier
Voltage Triode Pentode ·Pentode-Triode
5MB8
Frame-grid triode-pentode for color television, using the triode as a video amplifier and pentode as a burst amplifier.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9FA
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 5.6 V / 450 mA
Description
Miniature type with frame-grid pentode unit used in color television receivers. The triode unit is used in video-amplifier applications. The pentode unit is used in burst-amplifier service. Outlines section, 6B; requires miniature 9-contact socket. Type 5MB8 is identical with 9FA type 6MB8 except for heater ratings. 5MB8 6MB8 Heater Arrangement Series Parallel
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
- 5.6 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
- 7250 Ω
- Transconductance
- 0.008 S
- Amplification factor
- 58
- Max plate voltage
- 280 V
- Max plate dissipation
- 2 W
Published source values promoted where applicable.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 200000 Ω
- Transconductance
- 0.013 S
- Max plate voltage
- 280 V
- Max screen voltage
- 280 V
- Max plate dissipation
- 2 W
Published source values promoted where applicable.
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
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Amplification Factor
58
Published value from supplied target entry
Plate Resistance (Approx.)
200000 ohms
Published value from supplied target entry
Transconductance
13000
Published value from supplied target entry
Plate Current
11 mA
Published value from supplied target entry
Grid-No
3.4 mA
Published value from supplied target entry
Heater Voltage (ac/dc)
6.3 volts
Published value from supplied target entry
Heater Current
0.4 ampere
Published value from supplied target entry
Heater Warm-up Time
11 seconds
Published value from supplied target entry
Plate Voltage
280 volts
Published value from supplied target entry
Grid-No
280 volts
Published value from supplied target entry
Grid-No
300 volts
Published value from supplied target entry
Grid-No
300
Published value from supplied target entry
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 volt
Published value from supplied target entry
Plate Dissipation
2 watts
Published value from supplied target entry
Cathode Current
20 mA
Published value from supplied target entry
Grid-No
0.5 watt
Published value from supplied target entry
Plate Voltage
125 volts
Published value from supplied target entry
Grid-No
125 volts
Published value from supplied target entry
Grid-No.l Voltage
0 volt
Published value from supplied target entry
Plate Current
8 mA
Published value from supplied target entry
Grid-No
2 mA
Published value from supplied target entry
Transconductance
12000
Published value from supplied target entry
Amplification Factor
40
Published value from supplied target entry
Plate Resistance (Approx.)
125000 ohms
Published value from supplied target entry
Grid-No.l Voltage for plate current of
-5 volts
Published value from supplied target entry
Grid-No.l Voltage for plate current of
-3 volts
Published value from supplied target entry