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6DA4A

Indirectly heated damper diode designed to withstand high-voltage cathode-to-heater and cathode-to-plate pulses in direct-drive television circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 4CG
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 1.2 A

Description

The 6DA4A is a single indirectly heated diode intended for television horizontal-frequency damper service. It is designed to withstand high-voltage pulses between the cathode and both heater and plate in direct-drive circuits.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 4CG
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 1.2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

4CG - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1IC	—	IC EIA chart transcription; independent manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 4CG
PIN2IC	—	IC EIA chart transcription; independent manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 4CG
PIN3K	A	K — Cathode EIA chart transcription; independent manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 4CG
PIN5P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 4CG
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 4CG
PIN8H	—	H — Heater EIA chart transcription; independent manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 4CG

Section ratings

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Max plate dissipation: 8 W
Rectifier peak inverse voltage: 5000 V
Rectifier nominal output current: 185 mA
Rectifier peak forward current: 900 mA
Rectifier forward voltage drop: 30 V
Rectifier max heater-cathode voltage: 5000 V

Damper service; 30 V tube drop published at 340 mA conducting plate current.

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

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum heater-cathode voltage, heater negative DC
1000 V
Maximum heater-cathode voltage, heater negative total DC and peak
5000 V
Maximum heater-cathode voltage, heater positive DC
100 V
Maximum heater-cathode voltage, heater positive total DC and peak
300 V

Characteristic

Tube voltage drop at 340 mA
30 V

Capacitance

Heater-to-cathode capacitance
3 pF
Cathode-to-plate-and-heater capacitance
9 pF
Plate-to-cathode-and-heater capacitance
7 pF