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7UP25

Seven-inch direct-view CRT with magnetic focusing and deflection and a high-resolution P25 orange long-persistence screen. Sylvania specifies anode capability to approximately 13.2 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Seven-inch direct-view CRT with magnetic focus/deflection and high-resolution P25 orange long-persistence screen.

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: 600 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: 13200 V
Max screen voltage: 770 V

Published source values promoted where applicable.

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

Cathode Ray

Characteristics

Focusing method
Magnetic
Deflection method
Magnetic

Data set 02

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
Anode voltagel
200 V
Anode voltagel .................. 13'200 Volts dc
Grid No. 2 Voltage
770 V
Grid No. 2 Voltage ................ 770 Volts dc
Heater Negative with Respect to cathode
200 V
Heater Negative with Respect to cathode ..... 200 Volts
Heater positive with Respect to cathode .,
200 V
Heater positive with Respect to cathode .,... 200 Volts
Grid No. 1 Circuit Resistance
1.5 Mohm
Grid No. 1 Circuit Resistance 1.5 Megohms Max.

Characteristic

Heater current
600 mA
Published heater current
Heater voltage
6.3 V
Heater voltage ............ 6.3 Volts