7155

Cold-cathode decimal counting and selector tube with ten output cathodes and pulsed guide electrodes. Sequential discharge transfer performs electronic counting and selection.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B7G
Base pins: -
Nominal heater: -

Description

Cold-cathode decimal counting/selector tube with ten output cathodes and pulsed guide electrodes.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
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

MicrowaveTRSwitch

X-ray radiationInterelectrode capacitances

Regulator maximum current: 0.8 mA

Published ratings and characteristics promoted from the supplied Sylvania source.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

MicrowaveTRSwitch

Other

Supply Voltage
425 V
MediumSpeedCounter

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

MicrowaveTRSwitch

Other

Anode supply voltage minimum
400 V
Anode supply voltage maximum
800 V
Anode current maximum
0.8 mA
Pulse repetition maximum
100 kpps
Pulse
Typical anode supply voltage
400 V
Nominal tube drop
235 V

Characteristics

Transfer voltage
140 V

Application

Application
Decimal pulse counter / selector