Tube cross-reference

6AX4GTB alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6AX4GTB rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.

Replacement tubes for 6AX4GTB

The following tubes are recorded as possible replacements for 6AX4GTB. This direction does not establish that 6AX4GTB can replace them.

6CQ4

Rectifier - Damper Diode

Receiving Tubes

The database records 6CQ4 as a possible replacement for6AX4GTB.

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 for6AX4GTB.

Parallel heater circuits only
No-warmup series 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	1.2 A

6DE4

Rectifier - Damper Diode

Receiving Tubes

The database records 6DE4 as a possible replacement for6AX4GTB.

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 for6AX4GTB.

Parallel heater circuits only
No-warmup series circuits only

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 for6AX4GTB.

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 for6AX4GTB.

Parallel heater circuits only
No-warmup series 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	1.2 A

6DT4

Rectifier - Damper Diode

Receiving Tubes

The database records 6DT4 as a possible replacement for6AX4GTB.

Parallel heater circuits only
No-warmup series 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	1.2 A

Where 6AX4GTB can be used as the replacement

In these recorded relationships, 6AX4GTB is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6AX4GTB.

6AX4GT

Rectifier - Damper Diode

Receiving Tubes

The database records 6AX4GTB as a possible replacement for6AX4GT.

No special restrictions are recorded for this substitution.

Specification	6AX4GTB 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 6AX4GTB as a possible replacement for6AX4GTA.

No special restrictions are recorded for this substitution.

Specification	6AX4GTB 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

6DA4

Rectifier - Damper Diode

Receiving Tubes

The database records 6AX4GTB as a possible replacement for6DA4.

No special restrictions are recorded for this substitution.

Specification	6AX4GTB 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

6W4GT

Rectifier - Damper Diode

Receiving Tubes

The database records 6AX4GTB as a possible replacement for6W4GT.

No special restrictions are recorded for this substitution.

Specification	6AX4GTB 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 6AX4GTB as a possible replacement for6W4GTA.

No special restrictions are recorded for this substitution.

Specification	6AX4GTB 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 6AX4GTB specifications →