Tube cross-reference
E91H alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the E91H heptode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of E91H
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.
6687 Heptode
- Base
- Not recorded
- Socket
- B7G
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.27 A
Replacement tubes for E91H
The following tubes are recorded as possible replacements for E91H. This direction does not establish that E91H can replace them.
Heptode
The database records 6687 as a possible replacement forE91H.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Heptode | Heptode |
| Construction | Heptode | Heptode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.27 A | 0.27 A |
Where E91H can be used as the replacement
In these recorded relationships, E91H is the replacement tube. The listed original tubes are not automatically suitable as replacements for E91H.
Heptode
The database records E91H as a possible replacement for5915.
No special restrictions are recorded for this substitution.
| Specification | E91H replacement | Original tube |
|---|---|---|
| Tube type | Heptode | Heptode |
| Construction | Heptode | Heptode |
| Base | Not recorded | 7CH |
| Socket | B7G | B9A |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.27 A | 0.3 A |
Heptode
The database records E91H as a possible replacement for6687.
No special restrictions are recorded for this substitution.
| Specification | E91H replacement | Original tube |
|---|---|---|
| Tube type | Heptode | Heptode |
| Construction | Heptode | Heptode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.27 A | 0.27 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 E91H specifications →