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20AQ3

Miniature high-voltage booster diode designed for line-time-base circuits in transformerless television receivers; an energy-recovery device rather than a CRT EHT rectifier.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9CB
Socket code: B9A
Base pins: 9
Nominal heater: 20.2 V / 450 mA

Description

Miniature high-voltage booster diode used in line-time-base circuits of transformerless television receivers.

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: 9CB
Socket code: B9A
Base pins: 9
Nominal heater voltage: 20.2 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9CB - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1IC	—	IC Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN2IC	—	IC Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN3IC	—	IC Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN4H	—	H — Heater Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN5H	—	H — Heater Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN6IC	—	IC Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN7IC	—	IC Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN8IC	—	IC Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
PIN9P	A	P — Plate (Anode) Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB
CAP1K	A	K — Cathode Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9CB

Section ratings

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Max plate dissipation: 5 W
Rectifier peak inverse voltage: 6000 V
Rectifier nominal output current: 220 mA
Rectifier peak forward current: 550 mA
Rectifier max heater-cathode voltage: 6600 V

Published ratings, characteristics, typical operation, rectifier/regulator data, and capacitances reviewed.

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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Heater Voltage (ac/dc) 16.4
20.2 V
Heater Voltage (ac/dc) 16.4 20.2 volts
Heater Current 0.6
450 mA
Heater Current 0.6 0.45 ampere
Peak Heater-Cathode Voltage 6600
6600 V
Peak Heater-Cathode Voltage 6600 6600 volts
Supply Voltage at zero current
550 V
Supply Voltage at zero current 550 volts
Supply Voltage
250 V
Supply Voltage 250 volts
Peak Plate Current
550 mA
Peak Plate Current 550 mA
Average Plate Current
220 mA
Average Plate Current 220 mA
Plate Dissipation
5 W
Plate Dissipation 5 watts
# The pulse duration must not exceed 22 per cent of a cycle, or a maximum of
18 us
# The pulse duration must not exceed 22 per cent of a cycle, or a maximum of 18 microseconds
Peak inverse/negative-pulse plate voltage
6000 V
Published section value
Average output/plate current
220 mA
Published section value

Characteristic

Heater voltage
20.2 V
Rated heater condition
Heater current
450 mA
Rated heater condition