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Rectifier - Damper Diode ·BeamPower-Diode

38HE7

Combination television tube incorporating damper and horizontal-output functions, designed for line-deflection pulse service and sweep-energy recovery.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
12FS
Socket code
B12C
Base pins
12
Nominal heater
37.8 V / 450 mA

Description

Duodecar diode plus beam-power tube used as a damper diode and horizontal-deflection amplifier 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
12FS
Socket code
B12C
Base pins
12
Nominal heater voltage
37.8 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12FS - 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

Diode

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
4200 V
Rectifier nominal output current
200 mA
Rectifier peak forward current
1.2 A
Rectifier forward voltage drop
21 V
Rectifier max heater-cathode voltage
4200 V
Rectifier warm-up time
11 s

TV damper.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
6200 Ω
Transconductance
0.0088 S
Amplification factor
4.2
Max plate voltage
500 V
Max screen voltage
150 V
Max plate dissipation
10 W
Max screen dissipation
3.5 W
Max cathode current
230 mA
Rectifier max heater-cathode voltage
200 V

Horizontal deflection; pulse plate 5000 V.

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

Diode

Other

  • Peak inverse plate voltage

    4200 V

    Damper

  • DC output current

    200 mA

    Damper

SECTION 2

Beam Power

Other

  • DC plate-supply voltage

    500 V

    HorizontalDeflection

  • Peak positive pulse plate voltage

    5000 V

    HorizontalDeflection

  • Grid 2 voltage

    150 V

    HorizontalDeflection

  • DC cathode current

    230 mA

    HorizontalDeflection

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • RectifierMaximumPeakInverseVoltage

    4200 V

    Published datasheet value

  • RectifierNominalOutputCurrent

    200 mA

    Published datasheet value

  • RectifierPeakForwardCurrent

    1.2 A

    Published datasheet value

  • Heater Voltage

    37.8 V

    Nominal heater rating

  • Heater Current

    450 mA

    Nominal heater rating

Characteristic

  • TubeVoltageDropAt350mA

    21 V

    PlateCurrent=350mA

  • InterelectrodeCapacitanceDataPublished

    1 boolean

    See supplied datasheet capacitance table

SECTION 2

Beam Power

Characteristic

  • Transconductance

    8800 µS

    Published datasheet value

  • InterelectrodeCapacitanceDataPublished

    1 boolean

    See supplied datasheet capacitance table

Other

  • MaxPlateVoltage

    500 V

    Published datasheet value

  • MaxScreenVoltage

    150 V

    Published datasheet value

  • MaxPlateDissipation

    10 W

    Published datasheet value

  • MaxScreenDissipation

    3.5 W

    Published datasheet value

  • MaxCathodeCurrent

    230 mA

    Published datasheet value

  • Heater Voltage

    37.8 V

    Nominal heater rating

  • Heater Current

    450 mA

    Nominal heater rating

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Steady-State Peak Plate Current

    1200 mA

    TVDamper

SECTION 2

Beam Power

Other

  • Peak Positive Pulse Plate Voltage

    5000 V

    HorizontalDeflection

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • 0.45; warm-up time,

    11 seconds

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Voltage 5000 50 130

    130 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage 130 130 130

    130 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage .... 0 —22

    -22 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Resistance (Approx.)

    6200 Ω

    Published in approved 38HE7 target datasheet entry; Section1

  • Transconductance

    8800 µS

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Current 450

    60 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.2 Current 40

    2.8 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Voltage

    500 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak Positive-Pulse Plate Voltage*

    5000 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak Negative-Pulse Plate Voltage

    0 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.2 Voltage

    150 V

    Published in approved 38HE7 target datasheet entry; Section1

  • DC Grid-No.l Voltage, Negative-bias value

    55 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak Negative-Pulse Grid-No.l Voltage

    330 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Average Cathode Current

    230 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak Cathode Current

    800 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.l-Circuit Resistance

    1 MΩ

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak Inverse Plate Voltage*

    4200 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Average Plate Current

    200 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak value 4-200

    -4200 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Tube Voltage Drop for plate current of

    350 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Tube Voltage Drop for plate current of 350 mA

    21 V

    Published in approved 38HE7 target datasheet entry; Section1

  • # Pulse duration must not exceed 15% of a horizontal scanning cycle (

    10 microseconds

    Published in approved 38HE7 target datasheet entry; Section1

  • Heater Voltage (ac/dc) 37.8

    53.2 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Heater Current 0.45

    315 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate to Cathode and Heater

    10 pF

    Published in approved 38HE7 target datasheet entry; Section1

  • Cathode to Plate and Heater

    9 pF

    Published in approved 38HE7 target datasheet entry; Section1

  • Peak Positive-Pulse Plate Voltage

    5000 V

    Published in approved 38HE7 target datasheet entry; Section1

Characteristic

  • current of

    1 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • current of 1 mA —80

    -39 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Voltage 130 3500 50

    130 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage 130 130 130

    130 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage —22 0

    -22 V

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Resistance

    6200 Ω

    Published in approved 38HE7 target datasheet entry; Section1

  • Transconductance

    8800 µS

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate Current 450

    60 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid-No.2 Current 40

    2.8 mA

    Published in approved 38HE7 target datasheet entry; Section1

  • current of 1 mA -66

    -39 V

    Published in approved 38HE7 target datasheet entry; Section1

Capacitance

  • Heater to Cathode

    2 pF

    Published in approved 38HE7 target datasheet entry; Section1

  • Grid No.l to Cathode, Heater, Grid No.2, and Grid No.3

    19 pF

    Published in approved 38HE7 target datasheet entry; Section1

  • Plate to Cathode, Heater, Grid No.2, and Grid No.3

    8 pF

    Published in approved 38HE7 target datasheet entry; Section1

SECTION 2

Beam Power

Other

  • 0.45; warm-up time,

    11 seconds

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Voltage 5000 50 130

    130 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Voltage 130 130 130

    130 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage .... 0 —22

    -22 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Resistance (Approx.)

    6200 Ω

    Published in approved 38HE7 target datasheet entry; Section2

  • Transconductance

    8800 µS

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Current 450

    60 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.2 Current 40

    2.8 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Voltage

    500 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak Positive-Pulse Plate Voltage*

    5000 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak Negative-Pulse Plate Voltage

    0 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.2 Voltage

    150 V

    Published in approved 38HE7 target datasheet entry; Section2

  • DC Grid-No.l Voltage, Negative-bias value

    55 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak Negative-Pulse Grid-No.l Voltage

    330 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Average Cathode Current

    230 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak Cathode Current

    800 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.l-Circuit Resistance

    1 MΩ

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak Inverse Plate Voltage*

    4200 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Average Plate Current

    200 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak value 4-200

    -4200 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Tube Voltage Drop for plate current of

    350 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Tube Voltage Drop for plate current of 350 mA

    21 V

    Published in approved 38HE7 target datasheet entry; Section2

  • # Pulse duration must not exceed 15% of a horizontal scanning cycle (

    10 microseconds

    Published in approved 38HE7 target datasheet entry; Section2

  • Heater Voltage (ac/dc) 37.8

    53.2 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Heater Current 0.45

    315 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate to Cathode and Heater

    10 pF

    Published in approved 38HE7 target datasheet entry; Section2

  • Cathode to Plate and Heater

    9 pF

    Published in approved 38HE7 target datasheet entry; Section2

  • Peak Positive-Pulse Plate Voltage

    5000 V

    Published in approved 38HE7 target datasheet entry; Section2

Characteristic

  • current of

    1 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • current of 1 mA —80

    -39 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Voltage 130 3500 50

    130 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Voltage 130 130 130

    130 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage —22 0

    -22 V

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Resistance

    6200 Ω

    Published in approved 38HE7 target datasheet entry; Section2

  • Transconductance

    8800 µS

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate Current 450

    60 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid-No.2 Current 40

    2.8 mA

    Published in approved 38HE7 target datasheet entry; Section2

  • current of 1 mA -66

    -39 V

    Published in approved 38HE7 target datasheet entry; Section2

Capacitance

  • Heater to Cathode

    2 pF

    Published in approved 38HE7 target datasheet entry; Section2

  • Grid No.l to Cathode, Heater, Grid No.2, and Grid No.3

    19 pF

    Published in approved 38HE7 target datasheet entry; Section2

  • Plate to Cathode, Heater, Grid No.2, and Grid No.3

    8 pF

    Published in approved 38HE7 target datasheet entry; Section2