Tube cross-reference
6U5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6U5 tuning indicator. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6U5
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.
6G5 Tuning Indicator
- Base
- Not recorded
- Socket
- UX6
- Base pins
- 6
- Sections
- 2
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Replacement tubes for 6U5
The following tubes are recorded as possible replacements for 6U5. This direction does not establish that 6U5 can replace them.
Tuning Indicator
The database records 6G5 as a possible replacement for6U5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | Triode-TuningIndicator | Triode-TuningIndicator |
| Base | 6R | Not recorded |
| Socket | UX6 | UX6 |
| Base pins | 6 | 6 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Tuning Indicator
The database records 6H5 as a possible replacement for6U5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | Triode-TuningIndicator | Triode-TuningIndicator |
| Base | 6R | Not recorded |
| Socket | UX6 | IO |
| Base pins | 6 | Not recorded |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Tuning Indicator
The database records 6T5 as a possible replacement for6U5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | Triode-TuningIndicator | Triode-TuningIndicator |
| Base | 6R | 6R |
| Socket | UX6 | UX6 |
| Base pins | 6 | 6 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 6U5 can be used as the replacement
In these recorded relationships, 6U5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6U5.
Tuning Indicator
The database records 6U5 as a possible replacement for6G5.
No special restrictions are recorded for this substitution.
| Specification | 6U5 replacement | Original tube |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | Triode-TuningIndicator | Triode-TuningIndicator |
| Base | 6R | Not recorded |
| Socket | UX6 | UX6 |
| Base pins | 6 | 6 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Tuning Indicator
The database records 6U5 as a possible replacement for6H5.
No special restrictions are recorded for this substitution.
| Specification | 6U5 replacement | Original tube |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | Triode-TuningIndicator | Triode-TuningIndicator |
| Base | 6R | Not recorded |
| Socket | UX6 | IO |
| Base pins | 6 | Not recorded |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Tuning Indicator
The database records 6U5 as a possible replacement for6T5.
No special restrictions are recorded for this substitution.
| Specification | 6U5 replacement | Original tube |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | Triode-TuningIndicator | Triode-TuningIndicator |
| Base | 6R | 6R |
| Socket | UX6 | UX6 |
| Base pins | 6 | 6 |
| Sections | 2 | 2 |
| 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 6U5 specifications →