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Diode (NOT rectifier) ·Diode

201C

Small low-capacitance high-vacuum diode designed for detector, switching, and special high-frequency instrument applications, with operation extending into UHF.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
5 V / 300 mA

Description

The Eimac 201C is a small closely spaced low-capacitance high-vacuum diode with a 1000-volt peak-inverse-voltage rating for detector, switching, and special high-frequency applications.

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
300 mA
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

Diode

X-ray radiationInterelectrode capacitances
Plate resistance
8000 Ω
Max plate dissipation
0.1 W
Rectifier peak inverse voltage
1000 V
Rectifier nominal output current
1 mA
Rectifier warm-up time
60 s

Plate resistance promoted from published minimum value at Ep=12 V; maximum published value retained as parameter.

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 Eimac

Published operating points and test conditions from this source.

SECTION 1

Diode

Capacitance

  • Direct Interelectrode Capacitance

    0.7 pF

Characteristic

  • Heating Time Minimum

    30 s

  • Heating Time Nominal

    60 s

  • Zero Signal Voltage Minimum

    0.6 V

    110 Megohm load

  • Zero Signal Voltage Maximum

    1.4 V

    110 Megohm load

  • Resonant Frequency

    2800 MHz

  • Plate Resistance Maximum

    24000 ohm

    Ep=12 V

Other

  • Heater Current Maximum

    390 mA