Alternatives & variations Download PDF datasheet

7MP7

Seven-inch magnetic-focus and magnetic-deflection CRT primarily intended for radar indication, using a P7 long-persistence phosphor. Manufacturer sources give high-voltage operation to approximately 8 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 65-57
Socket code: DUODECAL5
Base pins: 5
Nominal heater: 6.3 V / 600 mA

Description

Seven-inch magnetic-focus and magnetic-deflection cathode-ray tube primarily intended for radar indication, using P7 phosphor.

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 65-57
Socket code: DUODECAL5
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

65-57 - 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: 8000 V
Max screen voltage: 770 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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Application

Application
Radar_Oscilloscope_Display text

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
Magnetic
Deflection method
Magnetic

Data set 03

1960 Du Mont

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Heater Voltage
6.3 V
Heater Current
600 mA
DeflectionMethod
Magnetic
FocusingMethod
Magnetic
Deflection Angle
50 degree
MinimumUsefulScreenDiameter
6 in
Phosphor
P7
Radar

Data set 04

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum Grid No. 2/screen voltage
770 V
Published maximum Grid No. 2 voltage
Maximum plate/anode voltage
8800 V
Published maximum plate/anode voltage
Anode Voltage
8800 V
Anode Voltage . 8,800Volts dc
Grid No. 2 Voltage
770 V
Grid No. 2 Voltage 770 Volts dc
Heater Negative with Respect to Cathode
140 V
Heater Negative with Respect to Cathode . 140 Volts
Heater Positive with Respect to Cathode
140 V
Heater Positive with Respect to Cathode 140 Volts
Anode Voltage2 4o00 7o
0 V
Anode Voltage2 4o00 7o00 Volts dc
Grid No. 2 Voltage 250
250 V
Grid No. 2 Voltage 250 250 Volts dc A Division of
Grid No. 1 Voltage for Cutoff3 -27 to -63 -27 to
-63 V
Grid No. 1 Voltage for Cutoff3 -27 to -63 -27 to -63 Volts dc SYI.VANIA ELECIRIC PRODUCTS, Inc.
Grid No. 1 Circuit Resistance
1.5 Mohm
Grid No. 1 Circuit Resistance . 1.5 Megohms Max. EMPORIU M, PENNSYI.VANIA

Characteristic

Heater Voltage
6.3 V
Heater Voltage 6.3 Volts

Data set 05

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum grid 2 positive voltage
700 V
Positive
Maximum grid 2 negative voltage
180 V
Negative
Maximum grid 1 negative-bias voltage
180 V
NegativeBias
Maximum grid 1 positive-bias voltage
0 V
PositiveBias
Maximum grid 1 positive-peak voltage
2 V
PositivePeak
Maximum peak grid 1 drive from cutoff
65 V
Peak heater-cathode voltage
125 V
HeaterNegative
Peak heater-cathode voltage
125 V
HeaterPositive
Typical ultor voltage low
4000 V
TypicalOperationLow
Typical ultor voltage high
7000 V
TypicalOperationHigh
Typical grid 2 voltage
250 V
TypicalOperation
Maximum accelerating/anode voltage
8000 V
Ultor Voltage* 4000
7000 V
Grid-No.2 Voltage 250
250 V
Grid-No.1 Voltage ° -27 to —63 —27 to
-63 V
Grid—No.l—Circuit Resistance 1
5 MΩ
Maximum

Capacitance

Grid 1 to all other electrodes capacitance
6 pF
Approximate
Cathode to all other electrodes capacitance
5 pF
Approximate

Characteristic

Deflection angle
50 degrees
Approximate
Current
600 mA
Grid No.l to All Other Electrodes
6 pF
Cathode to All Other Electrodes
5 pF
Ultor• VOLTAGE
8000 V
Maximum
PEAK GRID-No.l DRIVE FROM CUTOFF
65 V
Maximum
Deflection angle
50 degrees
Approximate