Alternatives & variations Download PDF datasheet

B7S3

RFT oscilloscope cathode-ray tube designed for waveform display and electronic measurement. Its electrostatic beam-control system and compact screen are intended for laboratory, service, and broadband instrument applications.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

A wideband oscilloscope cathode-ray tube with a 76 mm flat screen, side-connected deflection plates and post-acceleration, intended for symmetrical deflection operation.

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: 6.3 V
Nominal heater current: 300 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

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 1000 V
Max cathode current: 0.2 mA

Wide-band oscilloscope CRT electron-gun/deflection system with post-acceleration.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Acceleration voltage minimum
0.45 kV
Total acceleration voltage typical
1 kV
Focus voltage maximum
500 V
Deflection-plate voltage maximum
500 V
Cathode current maximum
200 µA
Heater-cathode voltage maximum
180 V

Capacitance

Input-grid capacitance
6.6 to 8.8 pF