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U1

Water-cooled directly heated vacuum diode for high-voltage industrial-generator rectifiers, using an external copper anode and providing approximately 7 A DC output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

Water-cooled rectifying vacuum diode for high-voltage rectifiers in industrial generators. External OFHC-copper anode forms part of the envelope and is water cooled; directly heated tungsten cathode. Explicit co-designation of RA7YB printed in the approved source.

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: -
Nominal heater current: -
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 voltage: 20000 V
Max plate dissipation: 20000 W
Rectifier peak inverse voltage: 55000 V
Rectifier nominal output current: 7 A

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

1966 Tesla Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Heater voltage
18 to 21 V
Heater current
110 A to 130 A
Cooling-water flow
60 L/min
1.5 kg/cm2 pressure

Characteristic

Emission current
20 A