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

Voltage Tetrode ·Tetrode

S12

Miniature screen-grid amplifier valve for low-voltage deaf-aid and battery-amplifier service. Its low heater demand suits compact portable equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
1.4 V / 50 mA

Description

The S12 is a miniature screen-grid amplifier valve for low-voltage deaf-aid and battery amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
1.4 V
Nominal heater current
50 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

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published maximum ratings and characteristics audited; remaining useful numerical data retained in parameter table.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • MENT CURRENT [1]

    0 mA

    MENT CURRENT 0-06.

  • MENT CURRENT [2]

    -6 A

    MENT CURRENT 0-06.

  • L [1]

    3 pF

    L 3 CURETREH 4T E530 Inter-electrode capacities.

  • L [2]

    4 pF

    L 3 CURETREH 4T E530 Inter-electrode capacities.

  • L [3]

    30 pF

    L 3 CURETREH 4T E530 Inter-electrode capacities.

  • H.T. voltage [1]

    36 V

    H.T. voltage ... . 36 36 36 52 52 52

  • H.T. voltage [2]

    36 V

    H.T. voltage ... . 36 36 36 52 52 52

  • H.T. voltage [3]

    36 V

    H.T. voltage ... . 36 36 36 52 52 52

  • H.T. voltage [4]

    52 V

    H.T. voltage ... . 36 36 36 52 52 52

  • H.T. voltage [5]

    52 V

    H.T. voltage ... . 36 36 36 52 52 52

  • H.T. voltage [6]

    52 V

    H.T. voltage ... . 36 36 36 52 52 52

  • Anode load resistance [1]

    150000 ohm

    Anode load resistance 150,000 250,000 Choke 150,000 250,000 Choke

  • Anode load resistance [2]

    250000 ohm

    Anode load resistance 150,000 250,000 Choke 150,000 250,000 Choke

  • Anode load resistance [3]

    150000 ohm

    Anode load resistance 150,000 250,000 Choke 150,000 250,000 Choke

  • Anode load resistance [4]

    250000 ohm

    Anode load resistance 150,000 250,000 Choke 150,000 250,000 Choke

  • Screen feed resistance I meg. Imeg. [meg. | meg. I

    5 ohm

    Screen feed resistance I meg. Imeg. [meg. | meg. I.5meg. | meg.

  • Total cathode current [1]

    0.1 mA

    Total cathode current 0.1} 0.1 0.16 0.18 0.12 0.27 mA

  • Total cathode current [2]

    0.1 mA

    Total cathode current 0.1} 0.1 0.16 0.18 0.12 0.27 mA

  • Total cathode current [3]

    0.16 mA

    Total cathode current 0.1} 0.1 0.16 0.18 0.12 0.27 mA

  • Total cathode current [4]

    0.18 mA

    Total cathode current 0.1} 0.1 0.16 0.18 0.12 0.27 mA

  • Total cathode current [5]

    0.12 mA

    Total cathode current 0.1} 0.1 0.16 0.18 0.12 0.27 mA

  • Total cathode current [6]

    0.27 mA

    Total cathode current 0.1} 0.1 0.16 0.18 0.12 0.27 mA

  • Grid bias [1]

    0

    Grid bias .. 0 0 0 0 0 0

  • Grid bias [2]

    0

    Grid bias .. 0 0 0 0 0 0

  • Grid bias [3]

    0

    Grid bias .. 0 0 0 0 0 0

  • Grid bias [4]

    0

    Grid bias .. 0 0 0 0 0 0

  • Grid bias [5]

    0

    Grid bias .. 0 0 0 0 0 0

  • Grid bias [6]

    0

    Grid bias .. 0 0 0 0 0 0

  • Stage gain [1]

    24

    Stage gain .. 24 26 57 29 32 57

  • Stage gain [2]

    26

    Stage gain .. 24 26 57 29 32 57

  • Stage gain [3]

    57

    Stage gain .. 24 26 57 29 32 57

  • Stage gain [4]

    29

    Stage gain .. 24 26 57 29 32 57

  • Stage gain [5]

    32

    Stage gain .. 24 26 57 29 32 57

  • Stage gain [6]

    57

    Stage gain .. 24 26 57 29 32 57

  • Published value

    1

    1 Anode Anode Screen

  • Published value

    2

    2 Grid Grid Grid

  • Published value

    3

    3 Filament Filament Filament

  • Published value

    4

    4 Filament Filament Filament