Data set 01
1959 Rogers
Published operating points and test conditions from this source.
SECTION 1
Triode
Application
Application
Frame time-base oscillator / AF amplifier
SECTION 2
Pentode
Application
Application
Frame output / AF output
Power - TV Vertical Output ·Pentode-Triode
8B8
Triode/power-pentode combination for television vertical oscillator/output and audio-frequency amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9EX
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 16 V / 300 mA
Description
High-mu triode plus power pentode used for television vertical oscillation/output and for audio-frequency amplification/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
- 9EX
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 16 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- 8 V
- Parallel heater current
- 600 mA
- Series capable
- Yes
9EX - 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, 9EX |
| PIN2Base Pin | A | G3 — Suppressor GridGroup 9EX2 Original chart label: 1G3; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN2Base Pin | A | K — CathodeGroup 9EX2 Original chart label: 1K; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN3Base Pin | A | G1 — Control Grid Original chart label: 1G1; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN4Base Pin | — | H — Heater Original chart label: H; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN5Base Pin | — | H — Heater Original chart label: H; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN6Base Pin | A | P — Plate (Anode) Original chart label: 1P; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN7Base Pin | A | G2 — Screen Grid Original chart label: 1G2; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN8Base Pin | B | K — Cathode Original chart label: 2K; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
| PIN9Base Pin | B | P — Plate (Anode) Original chart label: 2P; manufacturer verification pending | Unverified EIA Base Connections, printed page 132, 9EX |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0025 S
- Amplification factor
- 70
- Max plate voltage
- 250 V
Published Rogers/JETEC/RMA ratings and characteristics promoted where applicable; additional data retained as parameters.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 20000 Ω
- Transconductance
- 0.0064 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 7 W
- Max cathode current
- 50 mA
Published Rogers/JETEC/RMA ratings and characteristics promoted where applicable; additional data retained as parameters.
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
Other
Heater Voltage 8
16 V
Published in approved 8B8 target datasheet entry; Section1
Heater Current 0.6
300 mA
Published in approved 8B8 target datasheet entry; Section1
Heater-Cathode Voltage ±200
200 V
Published in approved 8B8 target datasheet entry; Section1
Plate Supply Voltage 550
550 V
Published in approved 8B8 target datasheet entry; Section1
Peak Plate Voltage* 600
2500 V
Published in approved 8B8 target datasheet entry; Section1
Plate Voltage 250
250 V
Published in approved 8B8 target datasheet entry; Section1
Peak Inverse Plate Voltage
500 V
Published in approved 8B8 target datasheet entry; Section1
Grid-No.2 (Screen-Grid) Supply Voltage
550 V
Published in approved 8B8 target datasheet entry; Section1
Grid-No.2 Voltage
250 V
Published in approved 8B8 target datasheet entry; Section1
Cathode Current
50 mA
Published in approved 8B8 target datasheet entry; Section1
Plate Dissipation (Frame Output)
5 W
Published in approved 8B8 target datasheet entry; Section1
Plate Dissipation (Audio Output)
7 W
Published in approved 8B8 target datasheet entry; Section1
Grid-No.2 Input
1.8 W
Published in approved 8B8 target datasheet entry; Section1
Peak Grid-No.2 Input
3.2 W
Published in approved 8B8 target datasheet entry; Section1
Characteristic
Plate Voltage 100 100 170 200
200 V
Published in approved 8B8 target datasheet entry; Section1
Grid-No.2 Voltage 100 170 200
200 V
Published in approved 8B8 target datasheet entry; Section1
Grid-No.l Voltage 0 —6 —11.5 —12.5
-16 V
Published in approved 8B8 target datasheet entry; Section1
Plate Resistance — 15000 16000 20500
20000 Ω
Published in approved 8B8 target datasheet entry; Section1
Transconductance 2500 6800 7500 6800
6400 µS
Published in approved 8B8 target datasheet entry; Section1
Plate Current 3.5 26 41 35
7 mA
Published in approved 8B8 target datasheet entry; Section1
Grid-No.2 Current 5 6.5
35 mA
Published in approved 8B8 target datasheet entry; Section1
SECTION 2
Pentode
Other
Heater Voltage 8
16 V
Published in approved 8B8 target datasheet entry; Section2
Heater Current 0.6
300 mA
Published in approved 8B8 target datasheet entry; Section2
Heater-Cathode Voltage ±200
200 V
Published in approved 8B8 target datasheet entry; Section2
Plate Supply Voltage 550
550 V
Published in approved 8B8 target datasheet entry; Section2
Peak Plate Voltage* 600
2500 V
Published in approved 8B8 target datasheet entry; Section2
Plate Voltage 250
250 V
Published in approved 8B8 target datasheet entry; Section2
Peak Inverse Plate Voltage
500 V
Published in approved 8B8 target datasheet entry; Section2
Grid-No.2 (Screen-Grid) Supply Voltage
550 V
Published in approved 8B8 target datasheet entry; Section2
Grid-No.2 Voltage
250 V
Published in approved 8B8 target datasheet entry; Section2
Cathode Current
50 mA
Published in approved 8B8 target datasheet entry; Section2
Plate Dissipation (Frame Output)
5 W
Published in approved 8B8 target datasheet entry; Section2
Plate Dissipation (Audio Output)
7 W
Published in approved 8B8 target datasheet entry; Section2
Grid-No.2 Input
1.8 W
Published in approved 8B8 target datasheet entry; Section2
Peak Grid-No.2 Input
3.2 W
Published in approved 8B8 target datasheet entry; Section2
Characteristic
Plate Voltage 100 100 170 200
200 V
Published in approved 8B8 target datasheet entry; Section2
Grid-No.2 Voltage 100 170 200
200 V
Published in approved 8B8 target datasheet entry; Section2
Grid-No.l Voltage 0 —6 —11.5 —12.5
-16 V
Published in approved 8B8 target datasheet entry; Section2
Plate Resistance — 15000 16000 20500
20000 Ω
Published in approved 8B8 target datasheet entry; Section2
Transconductance 2500 6800 7500 6800
6400 µS
Published in approved 8B8 target datasheet entry; Section2
Plate Current 3.5 26 41 35
7 mA
Published in approved 8B8 target datasheet entry; Section2
Grid-No.2 Current 5 6.5
35 mA
Published in approved 8B8 target datasheet entry; Section2