1G3GTA

Shielded filamentary high-voltage television flyback rectifier for CRT accelerating supplies, incorporating X-radiation shielding for operation at elevated EHT potentials.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 3C
Socket code: IO
Base pins: 8
Nominal heater: 1.25 V / 200 mA

Description

Directly heated glass-octal half-wave high-voltage flyback rectifier for television picture-tube anode supplies. Electrical ratings and characteristics were taken from the supplied RCA manual excerpt, including the published heater variant where applicable.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 3C
Socket code: IO
Base pins: 8
Nominal heater voltage: 1.25 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

3C - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Pin 1	—	IC Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C
PIN2Pin 2	—	F — Filament Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C
PIN3Pin 3	—	IC Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C
PIN5Pin 5	—	IC Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C
PIN7Pin 7	—	F — Filament Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C
PIN8Pin 8	—	IC Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C
CAP1Top cap	A	P — Plate (Anode) Transcribed directly from EIA chart; independent cross-check not yet performed.	Unverified EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3C

Section ratings

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 26000 V
Rectifier nominal output current: 0.5 mA
Rectifier peak forward current: 50 mA
Rectifier forward voltage drop: 100 V

High-voltage flyback/pulse rectifier; X-radiation maximum and filament limits preserved as parameters.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak inverse plate voltage DC component
21000 V
FlybackRectifier
Peak inverse plate voltage total DC and peak
26000 V
FlybackRectifier
Steady state peak plate current
50 mA
FlybackRectifier
DC output current
0.5 mA
FlybackRectifier

Characteristic

Tube voltage drop
100 V
Ib=7mA

Capacitance

Interelectrode capacitance
1.3 pF

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak Inverse Plate Voltage
26000 V
FlybackRectifier
Peak Plate Current
50 mA
Average Plate Current
0.5 mA
Filament Voltage Minimum
1.05 V
Filament Voltage Maximum
1.45 V

Characteristic

Tube Voltage Drop
100 V
PlateCurrent=7mA
X-Radiation Maximum
0.5 mR/hr
LotSamplingMaximum