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Power - Triode ·Triode-Triode

6AS7G

Low-mu twin power triode designed principally for series-regulator service in DC power supplies, with additional high-current pulse applications. Very low plate resistance and high current capability characterize both sections.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8BD
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 2.5 A

Description

Low-mu twin power triode used as a regulator tube in DC power supplies and in projection-television booster scanning service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8BD
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
2.5 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8BD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN12G1BG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN22PBP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN32KBK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN41G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN51PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN61KAK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN7H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN8H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
280 Ω
Transconductance
0.007 S
Amplification factor
2
Max plate voltage
250 V
Max plate dissipation
13 W
Max cathode current
125 mA

Published ratings/characteristics promoted where unambiguous.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
280 Ω
Transconductance
0.007 S
Amplification factor
2
Max plate voltage
250 V
Max plate dissipation
13 W
Max cathode current
125 mA

Second identical physical triode section; added to align physical section 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    135 V

    DCAmplifier

  • Cathode resistor

    125 Ω

    DCAmplifier

Characteristic

  • Plate resistance

    280 Ω

    DCAmplifier

  • Transconductance

    7000 µS

    DCAmplifier

  • Amplification factor

    2

    DCAmplifier

Data set 02

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    135 V

    DCAmplifier;EachSection

  • Cathode resistor

    250 Ω

    DCAmplifier;EachSection

  • Plate current

    125 mA

    DCAmplifier;EachSection

Characteristic

  • Plate resistance

    280 Ω

    EachSection

  • Transconductance

    7500 µS

    EachSection

  • Amplification factor

    2.1

    EachSection

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    2.5 A

  • Transconductance minimum

    5800 uS

  • Transconductance maximum

    8200 uS

Data set 04

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Transconductance

    0.007 A/V

    PromotedValue

  • Amplification factor

    2

    PromotedValue

  • 6.3t10~ VOLTS — published value 1

    10 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • 6.3t10~ VOLTS — published value 2

    2.5 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • THE 6AS7G IS A HIGH CURRENT, TWIN POWER TRIODE WIDELY USED IN ELECTRON — published value 1

    6

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • THE 6AS7G IS A HIGH CURRENT, TWIN POWER TRIODE WIDELY USED IN ELECTRON — published value 2

    7

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER VOLTAGE — published value 1

    6.3 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER VOLTAGE — published value 2

    10 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER CURRENT (Ef 6,}VOLTS) — published value 1

    6 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER CURRENT (Ef 6,}VOLTS) — published value 2

    5 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • TRANSCONDUCTANCE (PER SECTION)

    0 µMHOS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • AMPLIFICATION FACTOR

    2

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER VOLTAGE — published value 1

    5 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER VOLTAGE — published value 2

    6.9 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • PLATE VOLTAGE (DC)

    275 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER-CATHODE VOLTAGE (DC) — published value 1

    -3 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • HEATER-CATHODE VOLTAGE (DC) — published value 2

    300 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • PLATE CURRENT PER PLATE (DC)

    1

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • INDIVIDUAL PLATE CURRENT

    15 MA

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • INDIVIDUAL SECTION TRANSCONDUCTANCE

    5 µMHOS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • AMPLIFICATION FACTOR

    4

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • ADDITIONAL VOLTAGE (LESS THAN 10 VOLTS) NECESSARY FROM THE UNREGULATED

    10 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • VOLTAGE IS APPLIED. THIS IS ESPECIALLY NECESSARY IN CIRC.0 ITS WHERE THE

    0

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • LOW (BELOW 250 VOLTS) IT WILL BE NECESSARY TO PROVIDE ADDITIONAL NEGA

    250 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • PUT VOLTAGE IS TO BE VAR IABLE~ IT MAY BE NECESSAR Y~TO FOLLOW FIGURE 1.

    1

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • TUBE DROP AS POSSIBLE. A SAFETY MARGIN OF AT LEAST 5 VOLTS FROM THE ZERO

    5 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • GRID RESISTANCE THAT MEETS 80TH THESE CONDITIONS IS 1,000 OHMS. HEATER — published value 1

    80 OHMS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • GRID RESISTANCE THAT MEETS 80TH THESE CONDITIONS IS 1,000 OHMS. HEATER — published value 2

    1 OHMS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • VOLTAGE SHOULD BE KEPT AS CLOSE AS POSSIBLE TO 6.3 VOLTS AS MEASURED ON

    6.3 VOLTS

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • Ef = 6.3 Volts

    6.3 Volts

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

  • V■■■■■■■■■

    6.3 Volts

    OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

Other

  • Maximum plate voltage

    275 V

    PromotedValue

  • Maximum plate dissipation

    13 W

    PromotedValue

  • Maximum cathode current

    125 mA

    PromotedValue

Data set 05

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    2.5 A

  • Plate-supply voltage

    135 V

    ClassA;EachSection

  • Cathode-bias resistor

    250 ohm

    ClassA;EachSection

  • Plate current

    125 mA

    ClassA;EachSection

  • Plate dissipation

    13 W

    EachSection

Characteristic

  • Transconductance

    7000 uS

    EachSection

  • Plate resistance

    280 ohm

    EachSection

  • Amplification factor

    2

    EachSection

Capacitance

  • Grid-to-plate capacitance

    10.5 pF

    EachSection

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 6AS7G target entry; Section1

  • Plate Voltage

    250 V

    Published in approved 6AS7G target entry; Section1

  • Plate Current

    125 mA

    Published in approved 6AS7G target entry; Section1

  • Plate Dissipation

    13 W

    Published in approved 6AS7G target entry; Section1

  • Peak Negative-Pulse Plate Voltage*

    1700 V

    Published in approved 6AS7G target entry; Section1

  • DC Plate Current

    125 mA

    Published in approved 6AS7G target entry; Section1

  • For cathode-bias operation

    1 MΩ

    Published in approved 6AS7G target entry; Section1

  • • The duration of the voltage pulse must not exceed

    15 %

    Published in approved 6AS7G target entry; Section1

  • cycle. In a 525-line, 30-frame system,

    15 %

    Published in approved 6AS7G target entry; Section1

  • Plate Voltage

    300 V

    Published in approved 6AS7G target entry; Section1

  • Grid-No. 3 (Suppressor-Grid) Voltage, Positive value

    0 V

    Published in approved 6AS7G target entry; Section1

  • Grid-No. 2 Supply Voltage

    300 V

    Published in approved 6AS7G target entry; Section1

  • Grid-No.l (Control-Grid) Voltage, Positive-bias value

    0 V

    Published in approved 6AS7G target entry; Section1

  • Plate Dissipation

    2.5 W

    Published in approved 6AS7G target entry; Section1

  • For grid-No.2 voltages up to

    150 V

    Published in approved 6AS7G target entry; Section1

  • For grid-No.2 voltages up to 150 volts

    0.5 W

    Published in approved 6AS7G target entry; Section1

  • For grid-No.2 voltages between 150 and

    300 V

    Published in approved 6AS7G target entry; Section1

  • Plate Supply Voltage

    200 V

    Published in approved 6AS7G target entry; Section1

Capacitance

  • Grid to plate

    10.5 pF

    Published in approved 6AS7G target entry; Section1

  • Grid to heater and cathode

    6.8 pF

    Published in approved 6AS7G target entry; Section1

  • Plate to heater and cathode

    2.3 pF

    Published in approved 6AS7G target entry; Section1

  • Heater to cathode

    11 pF

    Published in approved 6AS7G target entry; Section1

  • Grid of unit No. 1 to grid of unit No. 2

    0.7 pF

    Published in approved 6AS7G target entry; Section1

  • Plate of unit No. 1 to plate of unit No. 2

    1.65 pF

    Published in approved 6AS7G target entry; Section1

  • Internal Shield

    7 pF

    Published in approved 6AS7G target entry; Section1

  • Internal Shield

    2.4 pF

    Published in approved 6AS7G target entry; Section1

Characteristic

  • Plate-Supply Voltage

    135 V

    Published in approved 6AS7G target entry; Section1

  • Cathode-Bias Posistor"

    250 Ω

    Published in approved 6AS7G target entry; Section1

  • Plate Resistance (Approx.)

    280 Ω

    Published in approved 6AS7G target entry; Section1

  • Transconductance

    7000 µS

    Published in approved 6AS7G target entry; Section1

  • Plate Current

    125 mA

    Published in approved 6AS7G target entry; Section1

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 6AS7G target entry; Section1

  • Heater Current

    450 mA

    Published in approved 6AS7G target entry; Section1

  • Internal Shield

    3 pF

    Published in approved 6AS7G target entry; Section1

  • Grid No.l to Plate

    0.03 pF

    Published in approved 6AS7G target entry; Section1

  • Grid-No.2 Supply Voltage

    150 V

    Published in approved 6AS7G target entry; Section1

  • Cathode-Bias Resistor

    180 Ω

    Published in approved 6AS7G target entry; Section1

  • Transconductance

    6200 µS

    Published in approved 6AS7G target entry; Section1

  • Plate Current

    9.5 mA

    Published in approved 6AS7G target entry; Section1

  • Grid-No.2 Current

    3 mA

    Published in approved 6AS7G target entry; Section1

  • Grid-No.l Voltage (Approx.) for plate current of 10 /iA

    -8 V

    Published in approved 6AS7G target entry; Section1