Tube cross-reference
E81L alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the E81L power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of E81L
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.
6686 Power - Pentode Single (NOT beam) (under 10W)
- Base
- 5686
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.375 A
Replacement tubes for E81L
The following tubes are recorded as possible replacements for E81L. This direction does not establish that E81L can replace them.
Power - Pentode Single (NOT beam) (under 10W)
The database records 6686 as a possible replacement forE81L.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | Noval | 5686 |
| Socket | B9A | Not recorded |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.375 A | 0.375 A |
Where E81L can be used as the replacement
In these recorded relationships, E81L is the replacement tube. The listed original tubes are not automatically suitable as replacements for E81L.
Power - Pentode Single (NOT beam) (under 10W)
The database records E81L as a possible replacement for6686.
No special restrictions are recorded for this substitution.
| Specification | E81L replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | Noval | 5686 |
| Socket | B9A | Not recorded |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.375 A | 0.375 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 E81L specifications →