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Voltage Dual Pentode ·Pentode-Pentode

3HS8

Twin pentode designed for television AGC, sync-separator, sync-clipper, and noise-gating service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
3.15 V / 600 mA

Description

Twin pentode used in television AGC, sync-separator, sync-clipper, and noise-gating service.

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
-
Socket code
B9A
Base pins
9
Nominal heater voltage
3.15 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

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
Transconductance
0.0011 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
1.7 W
Max screen dissipation
0.75 W
Max cathode current
22 mA
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Sparse-source exception: representative section row; this sheet does not reproduce the electrical ratings/characteristics of 6HS8; no external values imported.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0011 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
1.7 W
Max screen dissipation
0.75 W
Max cathode current
22 mA

Second physical pentode section; identical twin 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

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Application

    Combined sync and AGC functions in television receivers

    Section1

  • Plate voltage maximum each section

    300 V

    EachSection

  • Screen voltage maximum

    150 V

    CommonScreen

  • Positive grid-3 voltage maximum

    3 V

    EachSection

  • Peak positive grid-3 voltage maximum

    50 V

    EachSection

  • Negative grid-1 voltage maximum

    50 V

    Section1

  • Plate dissipation maximum each section

    1.7 W

    EachSection

  • Screen dissipation maximum

    0.75 W

    Section1

  • Cathode current maximum

    22 mA

    Section1

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater warm-up time

    11 s

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage (ac/dc) 3.5 4.2

    6.3 V

    Published in approved 4HS8 target entry; Section1

  • Heater Current 0.6 0.45

    300 mA

    Published in approved 4HS8 target entry; Section1

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 4HS8 target entry; Section1

  • Plate Voltage (Each Unit)

    300 V

    Published in approved 4HS8 target entry; Section1

  • Peak positive value

    50 V

    Published in approved 4HS8 target entry; Section1

  • DC negative value

    50 V

    Published in approved 4HS8 target entry; Section1

  • DC positive value

    3 V

    Published in approved 4HS8 target entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage

    150 V

    Published in approved 4HS8 target entry; Section1

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

    50 V

    Published in approved 4HS8 target entry; Section1

  • Cathode Current

    12 mA

    Published in approved 4HS8 target entry; Section1

  • Plate Dissipation (Each Unit)

    1.1 W

    Published in approved 4HS8 target entry; Section1

  • Grid-No. 2 Input

    0.75 W

    Published in approved 4HS8 target entry; Section1

  • 67.5

    67.5 V

    Published in approved 4HS8 target entry; Section1

  • Plate Current (Each Unit)

    2 mA

    Published in approved 4HS8 target entry; Section1

  • Grid-No.2 Current 7

    4.4 mA

    Published in approved 4HS8 target entry; Section1

  • Cathode Current 7.1

    8.5 mA

    Published in approved 4HS8 target entry; Section1

  • Grid-No.S-Circuit Resistance (Each Unit)

    0.5 MΩ

    Published in approved 4HS8 target entry; Section1

  • Grid-No.l-Circuit Resistance

    0.5 MΩ

    Published in approved 4HS8 target entry; Section1

  • Peak Plate Voltage*

    5500 V

    Published in approved 4HS8 target entry; Section1

  • Plate Dissipation

    35 W

    Published in approved 4HS8 target entry; Section1

  • Peak Plate Current

    325 mA

    Published in approved 4HS8 target entry; Section1

Capacitance

  • Grid No.3 to Plate (Each Unit)

    2 pF

    Published in approved 4HS8 target entry; Section1

  • Grid No.l to All Other Electrodes

    6 pF

    Published in approved 4HS8 target entry; Section1

  • Grid No.3 (Each Unit) to All Other Electrodes

    3.6 pF

    Published in approved 4HS8 target entry; Section1

Characteristic

  • Plate Voltage 100

    100 V

    Published in approved 4HS8 target entry; Section1

  • Grid-No.3 Voltage 0

    0 V

    Published in approved 4HS8 target entry; Section1

  • Grid-No 2 Voltage 67.5

    67.5 V

    Published in approved 4HS8 target entry; Section1

  • Grid-No.l Voltage

    0 V

    Published in approved 4HS8 target entry; Section1

  • Transconductance, Grid No.l to Plate

    1100 µS

    Published in approved 4HS8 target entry; Section1

  • Plate Current

    2 mA

    Published in approved 4HS8 target entry; Section1

  • Pulse Plate Voltage*

    3500 V

    Published in approved 4HS8 target entry; Section1

  • Grid-Voltage, Negative-bias value +200

    4.4 V

    Published in approved 4HS8 target entry; Section1

  • Peak Plate Current

    300 mA

    Published in approved 4HS8 target entry; Section1

  • Plate Resistance (Approx.)

    4600 Ω

    Published in approved 4HS8 target entry; Section1

  • Grid Voltage (Approx.) for plate current of

    1 mA

    Published in approved 4HS8 target entry; Section1

  • Grid Voltage (Approx.) for plate current of 1 mA

    13 V

    Published in approved 4HS8 target entry; Section1