Tube cross-reference
0B3 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 0B3 voltage regulator. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 0B3
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.
VR90 Voltage Regulator
- Base
- 4AJ
- Socket
- IO
- Base pins
- 8
- Sections
- 1
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Replacement tubes for 0B3
The following tubes are recorded as possible replacements for 0B3. This direction does not establish that 0B3 can replace them.
Voltage Regulator
The database records VR90 as a possible replacement for0B3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| 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 0B3 specifications →