1C21

Cold-cathode glow-discharge relay tube for DC operation. Gas ionization provides abrupt electronic control without a heater, similar in function to the OA4-G.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: CANDELABRA2
Base pins: -
Nominal heater: -

Description

The 1C21 is a cold-cathode glow-discharge relay tube intended for DC operation. The data gives starter-electrode breakdown limits plus 100 mA peak and 25 mA average cathode-current ratings.

Socket description

Candelabra double-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: CANDELABRA2
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

RelayControlSwitch

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Cold-cathode relay type with starter electrode.

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

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

RelayControlSwitch

Other

Maximum peak inverse anode voltage
180 V
Maximum peak cathode current
100 mA
Maximum average cathode current
25 mA

Characteristics

Starter-electrode breakdown voltage
66 to 80 V
Approximate range 66 to 80 V