Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Warmup Time
11 s
Voltage Pentode - Sharp Cutoff (single) ·Pentode
4BC5
Sharp-cutoff pentode designed for television IF, picture-IF, video, or VHF tuner amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 4.2 V / 450 mA
Description
Sharp-cutoff miniature pentode for television IF and wide-band amplifier service.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 4.2 V
- Nominal heater current
- 450 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
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 500000 Ω
- Transconductance
- 0.0061 S
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 2.3 W
- Max screen dissipation
- 0.55 W
- Rectifier warm-up time
- 11 s
Published ratings and characteristics 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
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
125 V
Screen-grid voltage
125 V
Cathode bias resistor
100 Ohm
Plate current
8 mA
Screen-grid current
2.4 mA
Characteristics
Plate resistance
500000 Ohm
Transconductance
6100 uS
Maximum useful frequency
400 MHz
Approximate
Capacitance
Grid-to-plate capacitance
0.02 pF
Shielded
Input capacitance
6.5 pF
Shielded
Output capacitance
2.6 pF
Shielded
Data set 03
1966 Tung Sol Electronic Tubes 1 of 4
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
125 V
IFAmplifier
Screen voltage
125 V
IFAmplifier
Control-grid voltage
-1.5 V
IFAmplifier
Plate current
10 mA
IFAmplifier
Screen current
3 mA
IFAmplifier
Characteristic
Transconductance
6000 µS
Section1
Capacitance
Grid-to-plate capacitance maximum
0.02 pF
Section1
Input capacitance
6 pF
Section1
Output capacitance
4 pF
Section1
Data set 04
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Heater Current
420 mA to 480 mA
Published nominal ± tolerance
Heater Voltage
4.2 V
At heater current 0.45 A
Warm-Up Time
11 s
Average
Peak Heater-Cathode Voltage - Heater Negative
200 V
Peak Heater-Cathode Voltage - Heater Positive
200 V
DC component must not exceed 100 V
Plate Voltage
150 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Screen Voltage
150 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Characteristics
Transconductance
6000 µS
Inherited from explicitly referenced 6-volt parent type; heater variant