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7VP31

Seven-inch oscillograph CRT electrically equivalent to the 7VP1 but fitted with a P31 screen. Electrostatic focusing and deflection provide precise waveform presentation for instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 612-37
Socket code: DUODECAL11
Base pins: 12
Nominal heater: 6.3 V / 600 mA

Description

7VP31 is a oscillograph tube using electrostatic focusing and electrostatic deflection. The source specifies a P31 screen and publishes CRT accelerating-electrode ratings, control/focus electrode limits, heater-cathode limits, capacitances, and operating or deflection characteristics. The datasheet explicitly states that its electrical characteristics are the same as 7VP1, with the listed differences applying primarily to the screen/optical or mechanical configuration.

Socket description

Duodecal 11-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 612-37
Socket code: DUODECAL11
Base pins: 12
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

612-37 - 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: 4000 V

CRT maximum accelerating/anode/ultor voltage is promoted to MaxPlateVoltage; additional electrode ratings, capacitances, operating conditions, deflection/focus and optical data are preserved as parameters.

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

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum grid 3 voltage
2000 V
Maximum grid 1 negative-bias voltage
200 V
NegativeBias
Maximum grid 1 positive-bias voltage
0 V
PositiveBias
Maximum grid 1 positive-peak voltage
2 V
PositivePeak
Maximum peak voltage between ultor and any deflecting electrode
750 V
Peak heater-cathode voltage
125 V
HeaterNegative
Peak heater-cathode voltage
125 V
HeaterPositive
Maximum accelerating/anode voltage
4000 V
ULTOR' VOLTAGE
4000 V
Maximum
GRID-No.3 VOLTAGE
2000 V
Maximum
ANY DEFLECTING ELECTRODE
750 V
Maximum
Grid-No.3 Current
-15 to 10 uA
for Focus 400 to 600
800 to 1200 V
Focused Spot -42
-84 V
Grid No.i-Circuit Resistance 1
5 MΩ
Maximum
Electrode Circuito
5 MΩ
Maximum
Phosphor persistence to 10 percent brightness
38 us
Approximate

Capacitance

Grid 1 to all other electrodes capacitance
6 pF
Approximate

Characteristic

Current
600 mA
Grid No.i to All Other Electrodes
6 pF
DJ1 to All Other Electrodes
9 pF
DJ2 to All Other Electrodes
9 pF
DJ3 to All Other Electrodes
7 pF
DJq to All Other Electrodes
7 pF