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Voltage Dual Triode Pentode ·Pentode-Triode-Triode

8BU11

Duodecar television tube combining a medium-mu twin triode with a sharp-cutoff pentode for receiver signal-processing and amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 12FP
Socket code: B12C
Base pins: 12
Nominal heater: 7.8 V / 600 mA

Description

Duodecar tube combining a medium-mu twin triode with a sharp-cutoff pentode for television receiver applications.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12FP
Socket code: B12C
Base pins: 12
Nominal heater voltage: 7.8 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12FP - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.0086 S
Amplification factor: 43
Max plate voltage: 330 V
Max plate dissipation: 1.8 W

Representative row for two electrically identical medium-mu triode sections; shared ratings/characteristics.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.0075 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.55 W

Sharp-cutoff pentode section.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.0086 S
Amplification factor: 43
Max plate voltage: 330 V
Max plate dissipation: 1.8 W

Second physical triode section; added to align rows with SectionCount.

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 01

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Characteristics and Ratings (PgltoPp) 0
11 pF
GENERAL
Heater Voltage AC or DC
7.8 V
GENERAL
Heater Current 0 620 04 Amperes Pg2 + Pg3 + h + i s )
5 pF
GENERAL
Pg3 +h +1 8 ) e+ o
3.2 pF
Grid to Plate (Tlg to Tlp) 1 7 pf MECHANICAL
Pg3 +h +dis ) 2
0 pF
Grid to Plate (Tlg to Tlp) 1 7 pf MECHANICAL
Pk + Pg3 +h+1i s )
1.7 pF
Grid to Plate (Tlg to Tlp) 1 7 pf MECHANICAL
Plate Voltage + + o o o o o o o o s o o o o s o
33 V
9-65 MAXIMUM RATINGS
Screen Supply Voltage + + + o o o o o +
330 V
9-65 MAXIMUM RATINGS
Positive DC Grid-Number 1 Voltage + + o o o o o o o o o o
0 V
9-65 MAXIMUM RATINGS
Plate Dissipation + + o o + s+ e e s s+ s s 2 e e e
2.5 W
9-65 MAXIMUM RATINGS
Screen Dissipation + 4+ e e 4 e e e e e e s e e e
0.55 W
9-65 MAXIMUM RATINGS
DC Component + o o o o o o o o s e o s o
100 V
9-65 MAXIMUM RATINGS
Total DC and Peak e e e e s 4 e e s e e e e
4200 V
9-65 MAXIMUM RATINGS
Total DC and Peak + v + o o o o o o o o o
200 V
9-65 MAXIMUM RATINGS
With Fixed Bias v o s o o s o o o o s o o o o o
0.5 MOhm
9-65 MAXIMUM RATINGS
With Cathode Bids + + o o o s o o o o o o o +
10 MOhm
9-65 MAXIMUM RATINGS
Positive DC Grid Voltage e e e e e e e e s e s e e e e e e e e e
0 V
9-65 MAXIMUM RATINGS
Plate Dissipation + o + o o o o o s+ e e 4 e e e + e + o
1.8 W
9-65 MAXIMUM RATINGS
DC COmMpOoNnent o o o o o o o o o o o o o o o s o o
100 V
9-65 MAXIMUM RATINGS
Total DC and Peak e e e e e a4 s s e e s e s
200 V
9-65 MAXIMUM RATINGS
Total DC and Peak + + + o s o o o o + o o
200 V
9-65 MAXIMUM RATINGS
With Fixed Bias o + + o o o o o o o o o o o s o o o o
0.5 MOhm
9-65 MAXIMUM RATINGS
With Cathode Bias v o o o o o o o o o o
10 MOhm
9-65 MAXIMUM RATINGS
Plate Voltage
125 V
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
Cathode-Blas Resistor
68 Ohm
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
Plate Resistance approximate
5000 Ohm
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
Transconductance
8600 uS
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
Plate Current
13.5 mA
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
Ib 100 Microamperes
-8 V
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
Heater voltage for a bogey tube at If
600 mA
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
The time required for the voltage across the heater to reach
80 %
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
4 Ecl
0 V
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
30 Ect
0 V
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
E /
25 V
CHARACTERISTICS AND TYPICAL OPERATION (Cont d)
PlateVoltageTypical
125 V
EachTriode
Cathode Bias Resistor
68 Ohm
EachTriode

Characteristic

Direct Interelectrode Capacitances Pg2 + Pg3 + h + i s )
2.4 pF
Direct Interelectrode Capacitances Pg2 + Pg3 + h + i s ) 2 4
Plate Voltage + + + o o o o o o o o o o e
2125 V
AVERAGE CHARACTERISTICS
Screen Voltage + s s e s s+ s 4 e 4 e e e e e
125 V
AVERAGE CHARACTERISTICS
Grid-Number 1 Voltage + o o o o o o o o o o s o s o
-1 V
AVERAGE CHARACTERISTICS
Plate Resistance approximate + + + + s s s
200000 Ohm
AVERAGE CHARACTERISTICS
Transconductance s o o o s e e e e e e e e
7500 uS
AVERAGE CHARACTERISTICS
Plate Current + o o o o o o o o s s 4 e e s e s e e+
12 mA
AVERAGE CHARACTERISTICS
Screen Current + + 4 s+ s s s o e e e 4 e s+ e e
4 mA
AVERAGE CHARACTERISTICS
Ib 30 Microamperes + + o+ s o o o o o o o e+ e 2+ +
8 V
AVERAGE CHARACTERISTICS
PlateCurrentTypical
13.5 mA
EachTriode

SECTION 2

Pentode

Other

PlateVoltageTypical
125 V
Pentode
ScreenVoltageTypical
125 V
Pentode

Characteristic

PlateCurrentTypical
12 mA
Pentode
ScreenCurrentTypical
4 mA
Pentode

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

up time,
11 seconds
Published in approved 8BU11 target datasheet entry; Section1
Plate Voltage 330
330 V
Published in approved 8BU11 target datasheet entry; Section1
Grid-No.l (Control-Grid) Voltage, Positive-bias value 0
0 V
Published in approved 8BU11 target datasheet entry; Section1
Plate Dissipation 2.5
1.8 W
Published in approved 8BU11 target datasheet entry; Section1
For grid-No.2 voltages up to
165 V
Published in approved 8BU11 target datasheet entry; Section1
For grid-No.2 voltages between 165 and
330 V
Published in approved 8BU11 target datasheet entry; Section1
Plate Supply Voltage 125
125 V
Published in approved 8BU11 target datasheet entry; Section1
Grid-No.2 Voltage
125 V
Published in approved 8BU11 target datasheet entry; Section1
For fixed-bias oi>eration 0.5
0.6 MΩ
Published in approved 8BU11 target datasheet entry; Section1
For cathode-bins operation 1
1 MΩ
Published in approved 8BU11 target datasheet entry; Section1

Characteristic

Grid-No.l Voltage
-1 V
Published in approved 8BU11 target datasheet entry; Section1
Cathode-Bias Resistor
68 Ω
Published in approved 8BU11 target datasheet entry; Section1
Plate Resistance (Approx.) 200000
50000 Ω
Published in approved 8BU11 target datasheet entry; Section1
Transconductance 7500
8600 µS
Published in approved 8BU11 target datasheet entry; Section1
Plate Current 12
13.5 mA
Published in approved 8BU11 target datasheet entry; Section1
Grid-No.2 Current
4 mA
Published in approved 8BU11 target datasheet entry; Section1
of 30 /iA
-8 V
Published in approved 8BU11 target datasheet entry; Section1

SECTION 2

Pentode

Other

up time,
11 seconds
Published in approved 8BU11 target datasheet entry; Section2
Plate Voltage 330
330 V
Published in approved 8BU11 target datasheet entry; Section2
Grid-No.l (Control-Grid) Voltage, Positive-bias value 0
0 V
Published in approved 8BU11 target datasheet entry; Section2
Plate Dissipation 2.5
1.8 W
Published in approved 8BU11 target datasheet entry; Section2
For grid-No.2 voltages up to
165 V
Published in approved 8BU11 target datasheet entry; Section2
For grid-No.2 voltages between 165 and
330 V
Published in approved 8BU11 target datasheet entry; Section2
Plate Supply Voltage 125
125 V
Published in approved 8BU11 target datasheet entry; Section2
Grid-No.2 Voltage
125 V
Published in approved 8BU11 target datasheet entry; Section2
For fixed-bias oi>eration 0.5
0.6 MΩ
Published in approved 8BU11 target datasheet entry; Section2
For cathode-bins operation 1
1 MΩ
Published in approved 8BU11 target datasheet entry; Section2

Characteristic

Grid-No.l Voltage
-1 V
Published in approved 8BU11 target datasheet entry; Section2
Cathode-Bias Resistor
68 Ω
Published in approved 8BU11 target datasheet entry; Section2
Plate Resistance (Approx.) 200000
50000 Ω
Published in approved 8BU11 target datasheet entry; Section2
Transconductance 7500
8600 µS
Published in approved 8BU11 target datasheet entry; Section2
Plate Current 12
13.5 mA
Published in approved 8BU11 target datasheet entry; Section2
Grid-No.2 Current
4 mA
Published in approved 8BU11 target datasheet entry; Section2
of 30 /iA
-8 V
Published in approved 8BU11 target datasheet entry; Section2