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Tube Tinker — Electron Tube Database

Tube cross-reference

6BT4 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6BT4 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.

Exact variations of 6BT4

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.

  • EZ40

    Rectifier - Full Wave

    Base
    Not recorded
    Socket
    B8A
    Base pins
    Not recorded
    Sections
    2
    Heater voltage
    6.3 V
    Heater current
    0.6 A

Replacement tubes for 6BT4

The following tubes are recorded as possible replacements for 6BT4. This direction does not establish that 6BT4 can replace them.

EZ40

Rectifier - Full Wave

Foreign To American

The database records EZ40 as a possible replacement for6BT4.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeRectifier - Full WaveRectifier - Full Wave
ConstructionRectifier-RectifierRectifier-Rectifier
BaseOCTALNot recorded
SocketIOB8A
Base pins8Not recorded
Sections22
Heater voltage6.3 V6.3 V
Heater current0.6 A0.6 A
UU9

Rectifier - Full Wave

Foreign To American

The database records UU9 as a possible replacement for6BT4.

  • Parallel heater circuits only
SpecificationOriginal tubeReplacement
Tube typeRectifier - Full WaveRectifier - Full Wave
ConstructionRectifier-RectifierRectifier-Rectifier
BaseOCTALNot recorded
SocketIONot recorded
Base pins8Not recorded
Sections22
Heater voltage6.3 V6.3 V
Heater current0.6 A0.63 A

Where 6BT4 can be used as the replacement

In these recorded relationships, 6BT4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6BT4.

EZ40

Rectifier - Full Wave

American To Foreign

The database records 6BT4 as a possible replacement forEZ40.

No special restrictions are recorded for this substitution.

Specification6BT4 replacementOriginal tube
Tube typeRectifier - Full WaveRectifier - Full Wave
ConstructionRectifier-RectifierRectifier-Rectifier
BaseOCTALNot recorded
SocketIOB8A
Base pins8Not recorded
Sections22
Heater voltage6.3 V6.3 V
Heater current0.6 A0.6 A
MU14

Rectifier - Full Wave

American To Foreign

The database records 6BT4 as a possible replacement forMU14.

No special restrictions are recorded for this substitution.

Specification6BT4 replacementOriginal tube
Tube typeRectifier - Full WaveRectifier - Full Wave
ConstructionRectifier-RectifierRectifier-Rectifier
BaseOCTALNot recorded
SocketIOB4
Base pins84
Sections22
Heater voltage6.3 V4 V
Heater current0.6 A2.5 A
UU5

Rectifier - Full Wave

American To Foreign

The database records 6BT4 as a possible replacement forUU5.

No special restrictions are recorded for this substitution.

Specification6BT4 replacementOriginal tube
Tube typeRectifier - Full WaveRectifier - Full Wave
ConstructionRectifier-RectifierRectifier-Rectifier
BaseOCTALNot recorded
SocketIONot recorded
Base pins8Not recorded
Sections22
Heater voltage6.3 V4 V
Heater current0.6 A2.3 A
UU9

Rectifier - Full Wave

American To Foreign

The database records 6BT4 as a possible replacement forUU9.

  • Parallel heater circuits only
Specification6BT4 replacementOriginal tube
Tube typeRectifier - Full WaveRectifier - Full Wave
ConstructionRectifier-RectifierRectifier-Rectifier
BaseOCTALNot recorded
SocketIONot recorded
Base pins8Not recorded
Sections22
Heater voltage6.3 V6.3 V
Heater current0.6 A0.63 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 6BT4 specifications →