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250R

Directly heated Eimac high-vacuum rectifier for rectifier units, voltage multipliers, and specialized high-voltage applications. Rated for approximately 60 kV peak inverse voltage and 250 mA nominal output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: J4
Base pins: 4
Nominal heater: 5 V / 10.5 A

Description

The Eimac 250R is a high-vacuum rectifier for rectifier units, voltage multipliers, and special high-voltage applications, rated to 60 kV peak inverse voltage.

Socket description

Jumbo 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: J4
Base pins: 4
Nominal heater voltage: 5 V
Nominal heater current: 10.5 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

Max plate dissipation: 150 W
Rectifier peak inverse voltage: 60000 V
Rectifier nominal output current: 250 mA
Rectifier peak forward current: 2.5 A

Published per-tube maximum ratings promoted from the source.

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 Eimac Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Average plate current
250 mA
Maximum average plate current from Eimac high-vacuum rectifier table.
Plate dissipation
150 W
Maximum plate dissipation from Eimac high-vacuum rectifier table.
Peak inverse voltage
60000 V
Maximum peak inverse voltage from Eimac high-vacuum rectifier table.
Filament voltage
5 V
Nominal filament voltage from Eimac high-vacuum rectifier table.
Filament current
10.5 A
Nominal filament current from Eimac high-vacuum rectifier table.

Data set 02

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Filament Voltage Range
4.75 to 5.25 V
For maximum tube life