Tube cross-reference
R18 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the R18 rectifier - half wave. Compare core specifications and verify every restriction before using a replacement.
Where R18 can be used as the replacement
In these recorded relationships, R18 is the replacement tube. The listed original tubes are not automatically suitable as replacements for R18.
Rectifier - Half Wave
The database records R18 as a possible replacement for6443.
No special restrictions are recorded for this substitution.
| Specification | R18 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Half Wave | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 9BW |
| Socket | B9A | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.1 A | 1.1 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 R18 specifications →