Tube cross-reference
6977 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6977 tuning indicator. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6977
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.
DM160 Tuning Indicator
- Base
- Subminiature wire-leaded
- Socket
- B4D
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 1 V
- Heater current
- 0.03 A
Replacement tubes for 6977
The following tubes are recorded as possible replacements for 6977. This direction does not establish that 6977 can replace them.
Tuning Indicator
The database records DM160 as a possible replacement for6977.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | TuningIndicator | TuningIndicator |
| Base | Subminiature wire-leaded | Subminiature wire-leaded |
| Socket | B5D | B4D |
| Base pins | 5 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 1 V | 1 V |
| Heater current | 0.03 A | 0.03 A |
Where 6977 can be used as the replacement
In these recorded relationships, 6977 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6977.
Tuning Indicator
The database records 6977 as a possible replacement forDM160.
No special restrictions are recorded for this substitution.
| Specification | 6977 replacement | Original tube |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | TuningIndicator | TuningIndicator |
| Base | Subminiature wire-leaded | Subminiature wire-leaded |
| Socket | B5D | B4D |
| Base pins | 5 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 1 V | 1 V |
| Heater current | 0.03 A | 0.03 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 6977 specifications →