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7658

Oil-immersed directly heated high-vacuum rectifier for very-high-voltage supplies. Its rugged thoriated-tungsten filament construction is rated for approximately 125 kV peak inverse voltage and substantial anode current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / 6.8 A

Description

Westinghouse 7658 September 15, 1960 HIGH VACUUM RECTIFIER TYPE 7658 The type 7658 is a high-voltage, vacuum rectifier designed for service in oil-immersed applications. |t features a thoriated-tungsten filament in a helicol design, to minimize risk of breakage, withstand electric field forces better, reduce anode-to-filament spacing for higher efficency and permit more tolerance in permissable filament voltage variations. ELECTRICAL: MA XIMUM RATINGS: Thoriated Tungsten Filament Absolute Maximum Volues Filament: Min. Bogey Mox. Peak Inverse Anode Voltage. . . . ... . ... 125 max. Kilovalts Voltage .................. 3.6 4.0 4.4 Volts Anade Current: Cusrent 6.8 - - Amperes Peak . . v v i i e e e e 750 mox. Ma, Seconds Average . . . o v v v n v o e e 150 max. Ma, MECHANICAL: 1. The dielectric value of she cooling oil must not be less than 250 Type of Cooling (Note 1) Qil Immersion KY peak per inch, Mounting Position Any Net Weight 8 Qunces Shipping Weight 4 Pounds AVERAGE FILAMENT-CURRE

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: 4 V
Nominal heater current: 6.8 A
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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 125000 V

Source-derived physical/electrical section.

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

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

The type
7658
The type 7658 is a high-voltage, vacuum rectifier designed for service in oil-immersed applications. |t features a
Filament: Min. Bogey Mox. Peak Inverse Anode Voltage
125
Filament: Min. Bogey Mox. Peak Inverse Anode Voltage. . . . ... . ... 125 max. Kilovalts
Voltage
4.4
Voltage .................. 3.6 4.0 4.4 Volts Anade Current:
Cusrent
750
Cusrent 6.8 - - Amperes Peak . . v v i i e e e e 750 mox. Ma,
Seconds Average . . . o v v v n v o e e
150
Seconds Average . . . o v v v n v o e e 150 max. Ma,
2000 4°“°‘
4
2000 4°“°‘