Tube cross-reference
423A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 423A voltage regulator. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 423A
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.
6140 Voltage Regulator
- Base
- Not recorded
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Replacement tubes for 423A
The following tubes are recorded as possible replacements for 423A. This direction does not establish that 423A can replace them.
Voltage Regulator
The database records 6140 as a possible replacement for423A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Regulator | Voltage Regulator |
| Construction | VoltageRegulator | VoltageRegulator |
| Base | Not recorded | Not recorded |
| Socket | UX4 | B9A |
| Base pins | 4 | 9 |
| Sections | 1 | 1 |
| Heater voltage | Not recorded | Not recorded |
| Heater current | Not recorded | Not recorded |
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 423A specifications →