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73

Directly heated high-vacuum rectifier with oxide-coated filament and convection cooling. Rated for approximately 13 kV peak inverse voltage and 20 mA DC output for high-voltage low-current supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: -
Nominal heater: 2.5 V / 4.25 A

Description

High-vacuum rectifier using an oxide-coated filament, convection cooling, and a 13 kV peak inverse-voltage rating.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: -
Nominal heater voltage: 2.5 V
Nominal heater current: 4.25 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: 13000 V
Rectifier nominal output current: 20 mA
Rectifier peak forward current: 3 A
Rectifier forward voltage drop: 135 V

Published electrical section from 73.pdf; identical repeated sections compressed when 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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

X Voltage
245 V
X Voltage 245 volts
T9 BULB . ¥ Current
4.25 A
T9 BULB . ¥ Current 4,25 amperes
~ Max, Tube Drop at
100 mA
~ Max, Tube Drop at 100 ma. 135 volts
Peak Inverse Voltage
13 V
Peak Inverse Voltage 13,000 volts