Tube cross-reference

6AU6A alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6AU6A voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.

Replacement tubes for 6AU6A

The following tubes are recorded as possible replacements for 6AU6A. This direction does not establish that 6AU6A can replace them.

6AU6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6 as a possible replacement for6AU6A.

Parallel heater circuits only
No-warmup series circuits only

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6BA6

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 6BA6 as a possible replacement for6AU6A.

Parallel heater circuits only
No-warmup series circuits only

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CC
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CB6A

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CB6A as a possible replacement for6AU6A.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CE5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CE5 as a possible replacement for6AU6A.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7BD
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

7543

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 7543 as a possible replacement for6AU6A.

Parallel heater circuits only
No-warmup series circuits only

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	76K
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

Where 6AU6A can be used as the replacement

In these recorded relationships, 6AU6A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6AU6A.

6AG5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6AG5.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	E7-1
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6AU6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6AU6.

No special restrictions are recorded for this substitution.

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6BA6

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6BA6.

No special restrictions are recorded for this substitution.

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CC
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6BC5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6BC5.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7BC
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.6 A

6CB6

Voltage Pentode

Receiving Tubes

The database records 6AU6A as a possible replacement for6CB6.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	7BK	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CB6A

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6CB6A.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CE5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6CE5.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7BD
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CF6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6CF6.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DC6

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6DC6.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DE6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6DE6.

Not suitable for all circuits

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

7543

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for7543.

No special restrictions are recorded for this substitution.

Specification	6AU6A replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7BK	76K
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 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 6AU6A specifications →