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

Specialized - Switching Tube ·CounterSelectorSwitch

6370

Decade counting display tube with heated cathode and fluorescent readout. Internal counting and selection stages provide direct visible decimal indication.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
Duodecal
Socket code
B12A
Base pins
12
Nominal heater
6.3 V / 300 mA

Description

Valvo E1T/6370 is a decade counting tube intended for electronic counting with a visible numerical indication. It uses an indirectly heated cathode, has a 6.3 V/0.3 A heater, and is specified for operation to about 30,000 impulses per second in the recommended circuit.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
Duodecal
Socket code
B12A
Base pins
12
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Duodecal - 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

CounterSelectorSwitch

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Beam-deflecting decade counting/indicating 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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

CounterSelectorSwitch

Characteristic

  • Heater voltage

    6.3 V

    Published rating

  • Heater current

    300 mA

    Published rating

Other

  • Maximum counting rate

    100 kHz

    CountingTube

Data set 02

1965 Nixie Valvo

Published operating points and test conditions from this source.

SECTION 1

CounterSelectorSwitch

Characteristics

  • Heater voltage

    6.3 V

    AC or DC heater

  • Heater current

    300 mA

    Indirect heater

  • Guaranteed life

    10000 h

    Average over 100 tubes

  • Failure factor

    1.5 permille/1000h

    Published reliability factor

  • Capacitance Ca1

    4.9 pF

    Published capacitance

  • Capacitance Ca2

    10.5 pF

    Published capacitance

  • Capacitance Cg1

    6.8 pF

    Published capacitance

  • Capacitance Cg4

    7.7 pF

    Published capacitance

  • Capacitance CD

    3.5 pF

    Published capacitance

  • Capacitance CD'

    3.8 pF

    Published capacitance

Other

  • External magnetic field

    - to 2 gauss

    Any direction

  • Recommended ambient illumination

    40 to 400 lux

    For reliable reading

  • Anode supply voltage

    300 V

    Recommended counting circuit

  • Anode current

    0.95 mA

    Recommended counting circuit

  • Maximum counting frequency

    30000 impulses/s

    Recommended circuit

  • Input pulse amplitude

    13.6 V

    Positive input pulse; tolerance +/-15%

  • Input pulse leading-edge slope

    20000000 to - V/s

    Greater than published minimum

  • Input pulse trailing-edge slope

    - to 1200000 V/s

    Less than published maximum