Tube cross-reference
N18 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the N18 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for N18
The following tubes are recorded as possible replacements for N18. This direction does not establish that N18 can replace them.
Power - Pentode Single (NOT beam) (under 10W)
The database records 3Q4 as a possible replacement forN18.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7BA |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.05 A | 0.05 A |
Where N18 can be used as the replacement
In these recorded relationships, N18 is the replacement tube. The listed original tubes are not automatically suitable as replacements for N18.
Power - Pentode Single (NOT beam) (under 10W)
The database records N18 as a possible replacement for3Q4.
No special restrictions are recorded for this substitution.
| Specification | N18 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7BA |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.05 A | 0.05 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 N18 specifications →