Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Transconductance
6100 uS
PentodeConnection;PlateVoltage=125V
Amplification Factor
42
TriodeConnection
Voltage Pentode - Sharp Cutoff (single) ·Pentode
3BC5
Sharp-cutoff miniature pentode for RF/IF amplification in compact equipment at frequencies extending to approximately 400 MHz.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7BD
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 3.15 V / 600 mA
Description
Sharp-cutoff pentode used as an RF or IF amplifier in compact radio equipment at frequencies up to 400 MHz.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7BD
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 3.15 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7BD - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN2G3 | A | G3 — Suppressor GridGroup 7BD2 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN2IS | A | IS — Internal ScreenGroup 7BD2 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN2K | A | K — CathodeGroup 7BD2 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN3H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN4H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN5P | A | P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN6G2 | A | G2 — Screen Grid EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN7G3 | A | G3 — Suppressor GridGroup 7BD7 EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN7IS | A | IS — Internal ScreenGroup 7BD7 EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
| PIN7K | A | K — CathodeGroup 7BD7 EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BD |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 600000 Ω
- Transconductance
- 0.0057 S
- Amplification factor
- 42
- Max plate voltage
- 320 V
- Max screen voltage
- 330 V
- Max plate dissipation
- 2.3 W
- Max screen dissipation
- 0.55 W
- Max cathode current
- 40 mA
- Rectifier warm-up time
- 11 s
Published ratings/characteristics promoted where semantically applicable; supplemental values retained in parameter table.
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
1965 Westinghouse Data Book
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Voltage
3.15 V
Heater Current
600 mA
ControlledWarmupHeater
1 boolean
Heater Warmup Time
11 s
Transconductance
6100 uS
PentodeConnection
Grid To Plate Capacitance
0.02 pF
Input Capacitance
7.5 pF
Output Capacitance
2.6 pF
Plate Resistance
9000 ohm
TriodeConnection
Application
Video/output pentode; triode connection also specified
Other
Plate Voltage
180 V
PentodeConnection
Screen Voltage
120 V
PentodeConnection
Grid Voltage
-2.5 V
PentodeConnection
Plate Current
8 mA
PentodeConnection
Screen Current
2.4 mA
PentodeConnection
Plate Voltage
250 V
TriodeConnection
Data set 04
1966 Tung Sol Electronic Tubes 1 of 4
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater voltage
3.15 V
Published heater rating
Heater current
600 mA
Published heater rating
Other
Maximum plate voltage
330 V
PentodeConnection
Maximum screen supply voltage
330 V
PentodeConnection
Maximum plate dissipation
2.3 W
PentodeConnection
Data set 05
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
rf or if amplifier at frequencies up to
400 MHz
Published in approved 6CE5 target datasheet entry; Section1
Heater Voltage (ac/dc) 3.15
6.3 V
Published in approved 6CE5 target datasheet entry; Section1
Heater Current 0.6
300 mA
Published in approved 6CE5 target datasheet entry; Section1
Heater Warm-up Time (Average)
11 seconds
Published in approved 6CE5 target datasheet entry; Section1
Grid-No.l (Control-Grid) Voltage, Positive-bias value. 0.006 0
0 V
Published in approved 6CE5 target datasheet entry; Section1
For grid-No.2 voltages up to
150 V
Published in approved 6CE5 target datasheet entry; Section1
For grid-No.2 voltages between 160 and
300 V
Published in approved 6CE5 target datasheet entry; Section1
Capacitance
Internal Shield
6.5 pF
Published in approved 6CE5 target datasheet entry; Section1
Shield
1.8 pF
Published in approved 6CE5 target datasheet entry; Section1
Grid No.l to Plate and Grid No.2
2.5 pF
Published in approved 6CE5 target datasheet entry; Section1
Grid No.l to Cathode, Heater, Grid No.3, and Internal Shield
3.9 pF
Published in approved 6CE5 target datasheet entry; Section1
Characteristic
Cathode-Bias Resistor 820 180 100
180 Ω
Published in approved 6CE5 target datasheet entry; Section1
Plate Resistance (Appro*.) 0.009 0.6 0.5
0.8 MΩ
Published in approved 6CE5 target datasheet entry; Section1
Transconductance 4400 4900 6100
6700 µS
Published in approved 6CE5 target datasheet entry; Section1
Plate Current 8 6 4.7 8
7.6 mA
Published in approved 6CE5 target datasheet entry; Section1
Grid-No.2 Current — — 1.4 2.4
2.1 mA
Published in approved 6CE5 target datasheet entry; Section1