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Voltage Radio Detector Converter ·Pentode-Triode

6U8A

Combined triode-pentode for oscillator, mixer, frequency-converter, RF, or IF service in television, communications, or mobile receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: EIA 9AE
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 450 mA

Description

6U8A is a TriodePentode vacuum tube documented in the RCA Receiving Tube Manual. The supplied excerpt was reviewed for heater data, section arrangement, maximum ratings, electrical characteristics, interelectrode capacitances, typical operating conditions, and stated applications.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: EIA 9AE
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

EIA 9AE - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.005 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 3 W
Max screen dissipation: 0.55 W
Max cathode current: 20 mA

Pentode section; screen rating is chart-dependent.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5300 Ω
Transconductance: 0.0075 S
Amplification factor: 40
Max plate voltage: 330 V
Max plate dissipation: 2.5 W
Max cathode current: 20 mA

Triode section.

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

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
Mixer / VHF frequency changer

SECTION 2

Triode

Application

Application
Oscillator

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Current
9.5 mA
Pentode;PlateVoltage=125V

SECTION 2

Triode

Characteristic

Plate Current
13.5 mA
Triode;PlateVoltage=125V

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

GridToPlateCapacitanceMaximum
0.015 pF
Input Capacitance
5 pF
Output Capacitance
3.5 pF
Plate Resistance
200000 ohm
Transconductance
5000 uS

Other

Plate Supply Voltage
125 V
PentodeUnit
Screen Voltage
110 V
PentodeUnit
Plate Current
9.5 mA
PentodeUnit
Screen Current
3.5 mA
PentodeUnit

SECTION 2

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
450 mA
ControlledWarmupHeater
1 boolean
Heater Warmup Time
11 s
Grid To Plate Capacitance
1.8 pF
Input Capacitance
2.8 pF
Output Capacitance
2 pF
Transconductance
7500 uS
Amplification Factor
60

Other

Plate Supply Voltage
125 V
TriodeUnit
Plate Current
13.5 mA
TriodeUnit

Data set 04

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
125 V
ClassA
Grid #2 voltage
110 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
9.5 mA
ClassA
Grid #2 current
3.5 mA
ClassA

Characteristic

Transconductance
5000 uS
Zero-bias transconductance
5500 uS
Eb=100V;Ec2=70V

Capacitance

Grid-to-plate capacitance
0.02 pF
Input capacitance
5.5 pF
Output capacitance
2.6 pF

SECTION 2

Triode

Other

Plate voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
13.5 mA
ClassA
Heater warm-up time
11 s
BothSections

Characteristic

Transconductance
7500 uS
Amplification factor
40

Capacitance

Grid-to-plate capacitance
1.5 pF
Input capacitance
2.8 pF
Output capacitance
1.5 pF

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
125 V
ClassA

Characteristic

Transconductance Alternate
5500 uS
ClassA,AlternateOperatingPoint

SECTION 2

Triode

Other

Plate Voltage
125 V
ClassA

Data set 06

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
330 V
Promoted published value
Maximum plate dissipation
3 W
Promoted published value
Grid No.l to plate
0.006 mA
Direct Interelectrode Capacitances:
Grid-No.2 Current
3.5 mA
Characteristics, Class A I Amplifier:
PLATE VOLTAGE.
330 V
Maximum Ratings, Design-Naximum Values:
GRID-No.2 VOLTAGE - See Grid-No.a Input.
2 V
Maximum Ratings, Design-Naximum Values:
For grid-No.2 voltages up
2 V
Maximum Ratings, Design-Naximum Values:
For grid-No.2 voltages be
2 V
Maximum Ratings, Design-Naximum Values:
PLATE DISSIPATION
3 W
Maximum Ratings, Design-Naximum Values:

Characteristic

Plate resistance
400000 ohm
Promoted published value
Transconductance
5200 uS
Promoted published value

SECTION 2

Triode

Other

Heater voltage
6.3 V
Nominal
Heater current
450 mA
Nominal
Maximum plate voltage
330 V
Promoted published value
Maximum plate dissipation
3 W
Promoted published value
Grid No.l to plate
0.006 mA
Direct Interelectrode Capacitances:
With heater voltage of
6 V
Characteristics, Class A I Amplifier:
Plate Supply Voltage
250 V
Characteristics, Class A I Amplifier:
Supply Voltage
110 V
Characteristics, Class A I Amplifier:
Cathode Resistor
68 ohm
Characteristics, Class A I Amplifier:
Plate Resistance (Approx.).
400000 ohm
Characteristics, Class A I Amplifier:
Plate Current
10 mA
Characteristics, Class A I Amplifier:
Grid-No.1 Voltage (Approx.)
1 V
Characteristics, Class A I Amplifier:
for plate µa
-10 V
Characteristics, Class A I Amplifier:
PLATE VOLTAGE.
330 V
Maximum Ratings, Design-Naximum Values:
SUPPLY VOLTAGE
330 V
Maximum Ratings, Design-Naximum Values:
tween
330 V
Maximum Ratings, Design-Naximum Values:
PLATE DISSIPATION
3 W
Maximum Ratings, Design-Naximum Values:
respect to cathode
200 V
Maximum Ratings, Design-Naximum Values:
much as
35 V
Maximum Ratings, Design-Naximum Values:
volts =
7.5 V
Maximum Ratings, Design-Naximum Values:
135 volts positive with respect to cathode, and al l other
135 V
Maximum Ratings, Design-Naximum Values:
With heater volts =
150 V
Maximum Ratings, Design-Naximum Values:
cathode resistor lohms) bypassed =
56 ohm
Maximum Ratings, Design-Naximum Values:
With heater volts =
250 V
Maximum Ratings, Design-Naximum Values:
2 supply volts = I
10 V
Maximum Ratings, Design-Naximum Values:

Characteristic

Plate resistance
5000 ohm
Promoted published value
Transconductance
8500 uS
Promoted published value
Amplification factor
40
Promoted published value
Voltage
20 V
Current at
0.45 V

Data set 07

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Pentode plate voltage
125 V
Pentode;ClassA
Pentode screen voltage
125 V
Pentode;ClassA
Pentode plate current
9.5 mA
Pentode;ClassA
Pentode screen current
3.5 mA
Pentode;ClassA

Characteristic

Pentode transconductance
5000 uS
Pentode
Pentode plate resistance
200000 ohm
Pentode

SECTION 2

Triode

Other

Heater voltage
6.3 V
Heater current
450 mA
Triode plate voltage
125 V
Triode;ClassA
Triode plate current
12 mA
Triode;ClassA

Characteristic

Triode transconductance
6500 uS
Triode
Triode amplification factor
40
Triode

Data set 08

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum Plate Voltage
330 V
Section2
Maximum Screen Voltage
330 V
Section2
Maximum Plate Dissipation
3 W
Section2
Maximum Screen Dissipation
0.55 W
Section2

Characteristic

Plate Resistance
200000 ohm
Section2
Transconductance
5000 uS
Section2

SECTION 2

Triode

Other

^fc T
40 MHz
Other;PublishedValue1
^fc T
4.7 MHz
Other;PublishedValue2
^fc T
6 MHz
Other;PublishedValue3
^fc T
9 MHz
Other;PublishedValue4
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
Average value
100 V
Other;PublishedValue1
Average value
100 V
Other;PublishedValue2
Plate Voltage
330 V
MaximumRating;PublishedValue1
Plate Voltage
330 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;PublishedValue1
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
MaximumRating;PublishedValue2

Capacitance

Grid to Plate
1.8 pF
Capacitance;PublishedValue1
Grid to Plate
1.8 pF
Capacitance;PublishedValue2
Pentode Grid No
3 pF
Capacitance;PublishedValue1
Pentode Grid No
2.8 pF
Capacitance;PublishedValue2
Pentode Grid No
2.8 pF
Capacitance;PublishedValue3
Pentode Grid No
3 pF
Capacitance;PublishedValue1
Pentode Grid No
1.5 pF
Capacitance;PublishedValue2
Pentode Grid No
2 pF
Capacitance;PublishedValue3
Grid No.l to Plate
0.01 pF
Capacitance;PublishedValue1
Grid No.l to Plate
0.006 pF
Capacitance;PublishedValue2
Grid No
3 pF
Capacitance;PublishedValue1
Grid No
5 pF
Capacitance;PublishedValue2
Grid No
5 pF
Capacitance;PublishedValue3
Grid No
3 pF
Capacitance;PublishedValue1
Grid No
2.6 pF
Capacitance;PublishedValue2
Grid No
3.5 pF
Capacitance;PublishedValue3
Triode Cathode to Heater
3 pF
Capacitance;PublishedValue1
Triode Cathode to Heater
3 pF
Capacitance;PublishedValue2
Internal Shield
3 pF
Capacitance;PublishedValue1
Internal Shield
3 pF
Capacitance;PublishedValue2
Pentode Grid No.l to Triode Plate
0.2 pF
Capacitance;PublishedValue1
Pentode Grid No.l to Triode Plate
0.2 pF
Capacitance;PublishedValue2
Pentode Plate to Triode Plate
0.1 pF
Capacitance;PublishedValue1
Pentode Plate to Triode Plate
0.02 pF
Capacitance;PublishedValue2