Tube cross-reference
6686 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6686 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6686
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.
E81L Power - Pentode Single (NOT beam) (under 10W)
- Base
- Noval
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.375 A
Replacement tubes for 6686
The following tubes are recorded as possible replacements for 6686. This direction does not establish that 6686 can replace them.
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 | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 5686 | Noval |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.375 A | 0.375 A |
Where 6686 can be used as the replacement
In these recorded relationships, 6686 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6686.
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 | 6686 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 5686 | Noval |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| 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 6686 specifications →