Tube cross-reference

6DA4 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6DA4 rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.

Exact variations of 6DA4

These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.

6DM4
Rectifier - Damper Diode
Base
4C
Socket
IO
Base pins
8
Sections
1
Heater voltage
6.3 V
Heater current
1.2 A

Replacement tubes for 6DA4

The following tubes are recorded as possible replacements for 6DA4. This direction does not establish that 6DA4 can replace them.

6AU4GT

Rectifier - Damper Diode

Receiving Tubes

The database records 6AU4GT as a possible replacement for6DA4.

Parallel heater circuits only

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	Not recorded
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.8 A

6AU4GTA

Rectifier - Damper Diode

Receiving Tubes

The database records 6AU4GTA as a possible replacement for6DA4.

Parallel heater circuits only

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.8 A

6AX4GTA

Rectifier - Damper Diode

Receiving Tubes

The database records 6AX4GTA as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	Not recorded
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6AX4GTB

Rectifier - Damper Diode

Receiving Tubes

The database records 6AX4GTB as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	5
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6CQ4

Rectifier - Damper Diode

Receiving Tubes

The database records 6CQ4 as a possible replacement for6DA4.

Parallel heater circuits only

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4L6
Socket	IO	B9A
Base pins	5	9
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.6 A

6DA4A

Rectifier - Damper Diode

Receiving Tubes

The database records 6DA4A as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6DE4

Rectifier - Damper Diode

Receiving Tubes

The database records 6DE4 as a possible replacement for6DA4.

Parallel heater circuits only

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	5
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.6 A

6DM4

Rectifier - Damper Diode

Receiving Tubes

The database records 6DM4 as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4C
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6DM4A

Rectifier - Damper Diode

Receiving Tubes

The database records 6DM4A as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6DQ4

Rectifier - Damper Diode

Receiving Tubes

The database records 6DQ4 as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	5
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6DT4

Rectifier - Damper Diode

Receiving Tubes

The database records 6DT4 as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	5
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

Where 6DA4 can be used as the replacement

In these recorded relationships, 6DA4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6DA4.

6AX4GT

Rectifier - Damper Diode

Receiving Tubes

The database records 6DA4 as a possible replacement for6AX4GT.

No special restrictions are recorded for this substitution.

Specification	6DA4 replacement	Original tube
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6AX4GTA

Rectifier - Damper Diode

Receiving Tubes

The database records 6DA4 as a possible replacement for6AX4GTA.

No special restrictions are recorded for this substitution.

Specification	6DA4 replacement	Original tube
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	Not recorded
Socket	IO	IO
Base pins	5	8
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6U4GT

Rectifier - Damper Diode

Receiving Tubes

The database records 6DA4 as a possible replacement for6U4GT.

No special restrictions are recorded for this substitution.

Specification	6DA4 replacement	Original tube
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	Not recorded
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6W4GT

Rectifier - Damper Diode

Receiving Tubes

The database records 6DA4 as a possible replacement for6W4GT.

No special restrictions are recorded for this substitution.

Specification	6DA4 replacement	Original tube
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	IO
Base pins	5	5
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

6W4GTA

Rectifier - Damper Diode

Receiving Tubes

The database records 6DA4 as a possible replacement for6W4GTA.

No special restrictions are recorded for this substitution.

Specification	6DA4 replacement	Original tube
Tube type	Rectifier - Damper Diode	Rectifier - Damper Diode
Construction	Rectifier	Rectifier
Base	4CG	4CG
Socket	IO	Not recorded
Base pins	5	5
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	1.2 A	1.2 A

Verify before substituting

Matching a base or heater voltage is not enough to prove that two tubes are interchangeable. Check pin connections, heater current, maximum ratings, bias requirements, warm-up behavior, and the equipment manufacturer’s service documentation before making a substitution.

View the complete 6DA4 specifications →