Data set 01
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Characteristic
Heater Warm-up Time
11 s
Average
Power - Beam (NOT sweep) ·BeamPower-Pentode
24BF11
Combination dual-control sharp-cutoff pentode and beam-power section for television FM detection and audio-frequency output amplification, with about 2.4 watts maximum-signal output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B12C
- Base pins
- 12
- Nominal heater
- 24.2 V / 315 mA
Description
Combined beam-power and dual-control sharp-cutoff pentode for FM detection and audio-frequency output amplification in television receivers.
Socket description
Duodecar 12-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B12C
- Base pins
- 12
- Nominal heater voltage
- 24.2 V
- Nominal heater current
- 315 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
Beam Power
X-ray radiationInterelectrode capacitances
- Plate resistance
- 30000 Ω
- Transconductance
- 0.0086 S
- Max plate voltage
- 165 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 6.5 W
- Max screen dissipation
- 1.8 W
- Max cathode current
- 65 mA
Reference/equivalence-only sparse-source exception: Section 1 power pentode; ratings/characteristics not reproduced.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 150000 Ω
- Transconductance
- 0.001 S
- Max plate voltage
- 330 V
- Max screen voltage
- 330 V
- Max plate dissipation
- 1.7 W
- Max screen dissipation
- 1.1 W
Reference/equivalence-only sparse-source exception: Section 2 sharp-cutoff dual-control pentode; ratings/characteristics not reproduced.
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
Beam Power
Other
Heater Warm-up Time (Average)
11 s
Other;PublishedValue1
Heater Warm-up Time (Average)
11 s
Other;PublishedValue2
Heater Warm-up Time (Average)
11 s
Other;PublishedValue3
Peak value
200 V
Other;PublishedValue1
Peak value
200 V
Other;PublishedValue2
Peak value
200 V
Other;PublishedValue3
Peak value
0 V
Other;PublishedValue4
Average value
100 V
Other;PublishedValue1
Average value
100 V
Other;PublishedValue2
Average value
100 V
Other;PublishedValue3
Average value
100 V
Other;PublishedValue4
Plate Voltage
165 V
MaximumRating
Grid-No
2 V
MaximumRating;PublishedValue1
Grid-No
150 V
MaximumRating;PublishedValue2
Average Cathode Current
65 mA
MaximumRating
Plate Dissipation
6.5 W
MaximumRating
Grid-No
2 W
MaximumRating;PublishedValue1
Grid-No
1.8 W
MaximumRating;PublishedValue2
Plate Voltage
145 V
TypicalOperation
Grid-No
2 V
TypicalOperation;PublishedValue1
Grid-No
110 V
TypicalOperation;PublishedValue2
Grid-No
1 V
TypicalOperation;PublishedValue1
Grid-No
-6 V
TypicalOperation;PublishedValue2
Peak AF Grid-No.l Voltage
6 V
TypicalOperation
Zero-Signal Plate Current
36 mA
TypicalOperation
Maximum-Signal Plate Current
40 mA
TypicalOperation
Zero-Signal Grid No
2 mA
TypicalOperation;PublishedValue1
Zero-Signal Grid No
3 mA
TypicalOperation;PublishedValue2
Maximum-Signal Grid-No
2 mA
TypicalOperation;PublishedValue1
Maximum-Signal Grid-No
9 mA
TypicalOperation;PublishedValue2
Plate Resistance (Approx.)
0.03 megohm
TypicalOperation
Transconductance
8600 uS
TypicalOperation
PLATE
92 V
TypicalOperation;PublishedValue1
PLATE
742 V
TypicalOperation;PublishedValue2
Load Resistance
3000 ohm
TypicalOperation
Total Harmonic Distortion
10 %
TypicalOperation
Maximum-Signal Power Output
2.4 W
TypicalOperation
For fixed-bias operation
0.25 megohm
MaximumCircuitValue
For cathode-bias operation
0.5 megohm
MaximumCircuitValue
Plate Voltage
330 V
MaximumRating
Grid-No
3 V
MaximumRating;PublishedValue1
Grid-No
28 V
MaximumRating;PublishedValue2
Grid No
2 V
MaximumRating;PublishedValue1
Grid No
330 V
MaximumRating;PublishedValue2
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
MaximumRating
Plate Dissipation
1.7 W
MaximumRating
For grid-No
2 V
MaximumRating;PublishedValue1
For grid-No
165 V
MaximumRating;PublishedValue2
For grid-No
1.1 V
MaximumRating;PublishedValue3
For grid-No
2 V
MaximumRating;PublishedValue1
For grid-No
165 V
MaximumRating;PublishedValue2
For grid-No
330 V
MaximumRating;PublishedValue3
For grid-No
300 V
MaximumRating;PublishedValue4
For fixed-bias operation
0.25 megohm
MaximumCircuitValue
For cathode-bias operation
0.5 megohm
MaximumCircuitValue
Maximum Plate Voltage
165 V
Section1;Promoted
Maximum Screen Voltage
150 V
Section1;Promoted
Maximum Plate Dissipation
6.5 W
Section1;Promoted
Maximum Screen Dissipation
1.8 W
Section1;Promoted
Maximum Cathode Current
65 mA
Section1;Promoted
Capacitance
Grid No.l to Plate
0.36 pF
Capacitance
Grid No
3 pF
Capacitance;PublishedValue1
Grid No
3.2 pF
Capacitance;PublishedValue2
and Internal Shield
8 pF
Capacitance
Grid No.l to Grid No
3 pF
Capacitance;PublishedValue1
Grid No.l to Grid No
0.11 pF
Capacitance;PublishedValue2
Grid No.l to Plate
0.24 pF
Capacitance
and Internal Shield
13 pF
Capacitance
and Internal Shield
10 pF
Capacitance
Characteristic
Plate Supply Voltage
150 V
Characteristic
Grid-No
2 V
Characteristic;PublishedValue1
Grid-No
100 V
Characteristic;PublishedValue2
Cathode-Bias Resistor
560 ohm
Characteristic
Plate Resistance (Approx.)
0.15 megohm
Characteristic
Transconductance, Grid No.l to Plate
1000 uS
Characteristic
Plate Current
1.3 mA
Characteristic
Grid-No
2 mA
Characteristic;PublishedValue1
Grid-No
2 mA
Characteristic;PublishedValue2
Grid-No.l Voltage (Approx.) for plate current of
10 V
Characteristic;PublishedValue1
Grid-No.l Voltage (Approx.) for plate current of
-4.5 V
Characteristic;PublishedValue2
Grid-No
3 V
Characteristic;PublishedValue1
Grid-No
10 V
Characteristic;PublishedValue2
Grid-No
-4.5 V
Characteristic;PublishedValue3
Plate Resistance
30000 ohm
Section1;Promoted
Transconductance
8600 uS
Section1;Promoted
SECTION 2
Pentode
Capacitance
Pentode Plate to Beam Power Plate
0.13 pF
Capacitance
Other
Maximum Plate Voltage
330 V
Section2;Promoted
Maximum Screen Voltage
330 V
Section2;Promoted
Maximum Plate Dissipation
1.7 W
Section2;Promoted
Maximum Screen Dissipation
1.1 W
Section2;Promoted
Characteristic
Plate Resistance
150000 ohm
Section2;Promoted
Transconductance
1000 uS
Section2;Promoted