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Rectifier - Half Wave ·Rectifier

F857B

Directly heated mercury-vapor half-wave rectifier for high-voltage supplies. Its massive filament, low arc voltage, and specified cathode preheating support roughly ten amperes of output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
5 V / 30 A

Description

Mercury-vapor half-wave rectifier for high-voltage rectifier circuits, with a 60-second cathode heating requirement and 15 V anode drop.

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
5 V
Nominal heater current
30 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
22000 V
Rectifier nominal output current
10 A
Rectifier peak forward current
40 A
Rectifier forward voltage drop
15 V
Rectifier warm-up time
60 s

Cooling: Convection or Forced Air

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

1962 ITT

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Maximum peak inverse anode voltage

    22000 V

  • Peak cathode current

    40 A

  • Average cathode current

    10 A

  • Cathode heating time

    60 s

  • Maximum frequency

    150 Hz

Characteristic

  • Anode voltage drop

    15 V

  • Critical anode voltage

    100 V

Data set 02

1962 ITT Industrial and Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

  • CriticalAnodeVoltage

    100 V

Other

  • MaximumSurgeCathodeCurrent

    400 A

    Maximum0.2Seconds

  • Maximum Frequency

    150 Hz