Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Warmup Time
11 s
Voltage - Dual Triode (similar high frequency) ·Triode-Triode
4BS8
Twin triode developed for VHF television tuner service, particularly cascode RF amplification where two high-frequency triode sections are used together for useful gain and isolation.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 4.5 V / 600 mA
Description
Twin triode for television VHF tuner and cascode amplifier service.
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
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 4.5 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 5000 Ω
- Transconductance
- 0.0072 S
- Amplification factor
- 36
- Max plate voltage
- 150 V
- Max plate dissipation
- 2 W
- Max cathode current
- 20 mA
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 11 s
Published ratings and characteristics promoted where applicable.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 5000 Ω
- Transconductance
- 0.0072 S
- Amplification factor
- 36
- Max plate voltage
- 150 V
- Max plate dissipation
- 2 W
- Max cathode current
- 20 mA
Second physical triode section; electrically identical twin 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 Westinghouse Data Book
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater Voltage
4.5 V
Heater Current
600 mA
Transconductance
7200 uS
RepresentativePublishedPoint
Plate Resistance
5000 ohm
RepresentativePublishedPoint
Plate Current
10 mA
ClassA; EachSection
Other
Maximum Plate Voltage
150 V
Maximum Plate Dissipation
2 W
Cascode Plate Supply Voltage
250 V
Cascode
Cascode Plate Current
16 mA
Cascode
Cascode Transconductance
10000 uS
Cascode
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
100 V
EachSection
Plate current
10 mA
EachSection
Application
VHF cascode amplifier
Section1
Characteristic
Transconductance
7200 µS
EachSection
Plate resistance
6800 Ω
EachSection
Amplification factor
43
EachSection
Data set 04
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater Current
560 mA to 640 mA
Published nominal ± tolerance
Heater Voltage
4.5 V
At heater current 0.6 A
Warm-Up Time
11 s
Average
Plate Supply Voltage
150 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Cathode Bias Resistor
220 Ω
Inherited from explicitly referenced 6-volt parent type; heater variant
Plate Current
10 mA
Inherited from explicitly referenced 6-volt parent type; heater variant
Characteristics
Amplification Factor
36
Inherited from explicitly referenced 6-volt parent type; heater variant
Plate Resistance
5000 Ω
Inherited from explicitly referenced 6-volt parent type; heater variant
Transconductance
7200 µS
Inherited from explicitly referenced 6-volt parent type; heater variant