Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Triode ·Triode-Triode

7105

Ruggedized 12.6 V-heater member of the 6AS7-type high-current regulator family. Twin low-mu sections provide long-life series-pass and demanding power-control service with low plate resistance and substantial current capability.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8BD
Socket code
IO
Base pins
8
Nominal heater
12.6 V / 1.25 A

Description

THE 7105 IS A 12.6 VOLT VERSION OF THE POPULAR RUGGEDIZED RELIABLE TYPE

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
12.6 V
Nominal heater current
1.25 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
Transconductance
0.007 S
Amplification factor
2
Max plate voltage
250 V
Max plate dissipation
13 W
Max cathode current
125 mA

Representative row for electrically identical repeated sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances
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 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • MinimumCathodeHeatingTime

    30 s

  • Maximum Heater Cathode Voltage

    300 V

    EitherPolarity

  • AltitudeForFullRatings

    60000 ft

  • ShockImpulse

    450 g

  • VibrationForce

    10 g

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    12.6 V

    Nominal

  • Heater current

    1.25 A

    Nominal

  • Maximum plate voltage

    250 V

    Promoted published value

  • Maximum plate dissipation

    13 W

    Promoted published value

  • Maximum cathode current

    125 mA

    Promoted published value

  • HEATER VOLTAGE 12. f~tFj,$ VOLTS

    12 V

    TITUDE RATINGS HIGH BULB TEMPERATURE LIMITS, AND LONG LIFE TESTS WITH

  • HEATER CURRENT (Ef

    1.25 V

    TITUDE RATINGS HIGH BULB TEMPERATURE LIMITS, AND LONG LIFE TESTS WITH

  • MINIMUM CATHODE HEATING TIME 3O SECONDS

    3 s

    TITUDE RATINGS HIGH BULB TEMPERATURE LIMITS, AND LONG LIFE TESTS WITH

  • AMPLIFICATION FACTOR 2.0

    2 A

    TITUDE RATINGS HIGH BULB TEMPERATURE LIMITS, AND LONG LIFE TESTS WITH

  • HEATER VOLTAGE

    13.2 V

    RATINGS

  • PLATE VOLTAGE (DC) --- 25O VOLTS

    25 V

    RATINGS

  • HEATER-CATHODE VOLTAGE (DC) -3OO

    300 V

    RATINGS

  • GRID CURRENT PER GRID

    5 mA

    RATINGS

  • PLATE CURRENT PER PLATE (DC)

    125 mA

    RATINGS

  • POWER DISSIPATION PER PLATE

    13 W

    RATINGS

  • ENVELOPE TEMPERATURE 23O °C

    23 C

    RATINGS

  • ALTITUDE FOR FULL RATINGS 6O OOO FEET

    6 ft

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • GRID CURRENT (MAX.)

    -3 mA

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • HEATER-CATHODE LEAKAGE E hk- 1'

    25 V

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • HEATER CURRENT MIN.

    1.35 mA

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • INDIVIDUAL PLATE CURRENT (OC)

    150 mA

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • LOT AVERAGE PLATE CURRENT (SAME CONDTIONS)(DC)

    135 mA

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • PLATE CURRENT S DIFFERENCE BETWEEN SECTIONS (DC)

    25 mA

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • AMPLIFICATION FACTOR 7.5 2.5

    2.5 A

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • HEATER CURRENT ~ 6.3V.

    1.35 A

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • GRID RESISTANCE THAT MEETS BOTH THESE CONDITIONS IS

    1000 ohm

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

  • VOLTAGE SHOULD BE KEPT AS CLOSE AS POSSIBLE TO i

    26 V

    ALTITUDE FOR FULL RATINGS 6O OOO FEET

Characteristic

  • Transconductance

    7000 uS

    Promoted published value

  • Amplification factor

    2

    Promoted published value