Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Characteristic
Heater Warmup Time
11 s
Voltage Radio Detector Converter ·Tetrode
4BN6
Gated-beam FM and intercarrier-sound discriminator tube for limiter-discriminator service in television and FM receivers, combining detection and signal processing in one specialized beam structure.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7DF
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 4.2 V / 450 mA
Description
Beam tube used as a combined limiter, discriminator, and audio-voltage amplifier in intercarrier television and FM receivers.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7DF
- 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
- Yes
7DF - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1IS | A | IS — Internal ScreenGroup 7DF1 Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN1K | A | K — CathodeGroup 7DF1 Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN2G1 | A | G1 — Control Grid Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN3H | — | H — Heater Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN4H | — | H — Heater Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN5G2 | A | G2 — Screen Grid Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN6G3 | A | G3 — Suppressor Grid Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
| PIN7P | A | P — Plate (Anode) Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DF |
Section ratings
1 physical section, each with unique specifications.
Section 1
Tetrode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 300 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 1.5 W
- Max cathode current
- 13 mA
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 11 s
Tung-Sol 4BN6 gated-beam electrostatic-deflection FM discriminator combining limiting, frequency detection and audio voltage amplification, particularly intercarrier-sound TV service. Heater 4.2 V 450 mA for controlled approximately 11-second warm-up in 450 mA series-heater strings. Maximum plate SUPPLY voltage 330 V is not identical to a maximum actual plate-electrode voltage; existing 300 V promoted plate limit retained. Manufacturer gives grid voltage max 110 V, peak positive limiter-grid 60 V and DC cathode current maximum 13 mA. Typical 10.7 MHz ±75 kHz or 4.5 MHz ±25 kHz limiter-discriminator operating modes have conditional plate-supply and load-resistor specifications. Existing physical Tetrode section and parent RadioDetectorConverter classification retained because this catalog lacks a specific gated-beam discriminator section/type. Capacitances and shielding of limiter/quadrature grids documented.
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
Tetrode
Characteristics
Heater Voltage
4.2 V
Heater Current
450 mA
Other
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
1.5 W
Input Signal Center Frequency
10.7 MHz
FMDetector
Frequency Deviation
75 kHz
FMDetector
Plate Supply Voltage
285 V
Representative
Plate Voltage
122 V
Representative
Accelerator Voltage
100 V
Representative
Data set 03
1966 Tung Sol Electronic Tubes 1 of 4
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
Application
Gated-beam FM and intercarrier sound discriminator
Section1
Plate voltage
100 V
FMDiscriminator
Screen voltage
100 V
FMDiscriminator
Limiter-grid drive
As specified in source
FMDiscriminator
Characteristic
Heater warm-up time
11 s
Section1
Data set 04
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Tetrode
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
Plate Supply Voltage
330 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Limiter Grid Peak Positive Voltage
60 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Cathode Current
13 mA
Inherited from explicitly referenced 6-volt parent type; heater variant
Plate Voltage
122 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Accelerator Voltage
100 V
Inherited from explicitly referenced 6-volt parent type; heater variant
Cathode Bias Resistor Minimum
200 Ω
Inherited from explicitly referenced 6-volt parent type; heater variant
Cathode Bias Resistor Maximum
400 Ω
Inherited from explicitly referenced 6-volt parent type; heater variant
Data set 05
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
Plate Current
9 mA
Published in approved 6KS6 target datasheet entry; Section1
Grid-Circuit Resistance
0.5 MΩ
Published in approved 6KS6 target datasheet entry; Section1
Heater Voltage (ac/dc) 3.15 4.2 6.3
12.6 V
Published in approved 6KS6 target datasheet entry; Section1
Heater Current 0.6 0.45 0.3
150 mA
Published in approved 6KS6 target datasheet entry; Section1
age) 11
11 seconds
Published in approved 6KS6 target datasheet entry; Section1
Plate-Supply Voltage
330 V
Published in approved 6KS6 target datasheet entry; Section1
Grid-No.2 Voltage
110 V
Published in approved 6KS6 target datasheet entry; Section1
Grid-No. 1 Voltage, Positive peak value
60 V
Published in approved 6KS6 target datasheet entry; Section1
Cathode Current
13 mA
Published in approved 6KS6 target datasheet entry; Section1
Heater Voltage (ac/dc) 6.3
8.4 V
Published in approved 6KS6 target datasheet entry; Section1
Heater Current 0.6
450 mA
Published in approved 6KS6 target datasheet entry; Section1
Heater Warm-up Time (Average) 11
11 seconds
Published in approved 6KS6 target datasheet entry; Section1
Plate Voltage
330 V
Published in approved 6KS6 target datasheet entry; Section1
Grid Voltage —1
-3 V
Published in approved 6KS6 target datasheet entry; Section1
Plate Resistance (Approx.) 21000
28000 Ω
Published in approved 6KS6 target datasheet entry; Section1
3600
2600 µS
Published in approved 6KS6 target datasheet entry; Section1
Plate Current 1.6
1.6 mA
Published in approved 6KS6 target datasheet entry; Section1
Grid Voltage (Approx.) for plate current of 10 /iA —2.6
-5.5 V
Published in approved 6KS6 target datasheet entry; Section1
Peak
54 mA
Published in approved 6KS6 target datasheet entry; Section1
Capacitance
Internal Shield
3.3 pF
Published in approved 6KS6 target datasheet entry; Section1
Triode Grid to Triode Plate
2.6 pF
Published in approved 6KS6 target datasheet entry; Section1
Triode Grid to Cathode and Heater
3.6 pF
Published in approved 6KS6 target datasheet entry; Section1
Triode Plate to Cathode and Heater
0.26 pF
Published in approved 6KS6 target datasheet entry; Section1
Diode Cathode to All Other Electrodes (Each Diode Unit)
5 pF
Published in approved 6KS6 target datasheet entry; Section1
Diode Plate to Diode Cathode and Heater (Each Diode Unit)
1.9 pF
Published in approved 6KS6 target datasheet entry; Section1
Diode Cathode to Diode Plate and Heater (Each Diode Unit)
4.8 pF
Published in approved 6KS6 target datasheet entry; Section1
Diode Plate to All Other Electrodes (Each Diode Unit)
3 pF
Published in approved 6KS6 target datasheet entry; Section1