Tube cross-reference
VR90 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the VR90 voltage regulator. Compare core specifications and verify every restriction before using a replacement.
Exact variations of VR90
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.
0B3 Voltage Regulator
- Base
- 4AJ
- Socket
- IO
- Base pins
- 8
- Sections
- 1
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Where VR90 can be used as the replacement
In these recorded relationships, VR90 is the replacement tube. The listed original tubes are not automatically suitable as replacements for VR90.
Voltage Regulator
The database records VR90 as a possible replacement for0B3.
No special restrictions are recorded for this substitution.
| Specification | VR90 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Regulator | Voltage Regulator |
| Construction | VoltageRegulator | VoltageRegulator |
| Base | 4AJ | 4AJ |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| 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 VR90 specifications →