1C21P

Russian high-voltage rectifier for television line-scanning circuits, rectifying horizontal flyback pulses to generate the CRT accelerating-voltage supply.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 1.4 V / 690 mA

Description

The 1C21P is an indirectly heated high-voltage kenotron for television line-scanning circuits.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 1.4 V
Nominal heater current: 690 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 25000 V
Rectifier nominal output current: 0.6 mA
Rectifier peak forward current: 40 mA
Rectifier warm-up time: 15 s

Values promoted where clearly identifiable from Russian source.

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

195X Russian

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Anode voltage
100 V
Published test point
Anode current
8 mA
Published test point
Anode-cathode capacitance
3 pF
Published value
Rectified voltage
18 kV
Published value
Rectified current
0.6 mA
Average
Oscillator frequency
164 kHz
Published test condition
Warm-up time
15 s
Published value

Other

Peak reverse voltage
25 kV
Peak

Data set 02

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Plate current
23.5 mA
Published Russian-source value; OCR-normalized.
Rectified output current
6 kV
Published Russian-source value; OCR-normalized.
Service life
21500 h
Published Russian-source value; OCR-normalized.
Rectified output current
135 µA
Published Russian-source value; OCR-normalized.
Peak inverse voltage
10 kV
Published Russian-source value; OCR-normalized.
Rectified output current
300 µA
Published Russian-source value; OCR-normalized.
Plate current
12 mA
Published Russian-source value; OCR-normalized.
Rectified output current
18 kV
Published Russian-source value; OCR-normalized.
Service life
2000 h
Published Russian-source value; OCR-normalized.
Peak inverse voltage
27 kV
Published Russian-source value; OCR-normalized.
Rectified output current
800 V
Published Russian-source value; OCR-normalized.
Plate current
40 mA
Published Russian-source value; OCR-normalized.
Plate current
17.5 mA
Published Russian-source value; OCR-normalized.
Service life
21500
Published Russian-source value; OCR-normalized.
Plate current
20 mA
Published Russian-source value; OCR-normalized.
Rectified output current
25.4
Published Russian-source value; OCR-normalized.
Peak inverse voltage
12.5 kV
Published Russian-source value; OCR-normalized.
Rectified output current
7.5 V
Published Russian-source value; OCR-normalized.
Plate current
45 mA
Published Russian-source value; OCR-normalized.
Heater voltage
1.1 V
Nominal/published heater value.
Heater current
30 mA
Nominal/published heater value.