Tube cross-reference
UL84 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the UL84 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Exact variations of UL84
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.
45B5 Power - Pentode (NOT beam)
- Base
- Not recorded
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 45 V
- Heater current
- 0.1 A
Replacement tubes for UL84
The following tubes are recorded as possible replacements for UL84. This direction does not establish that UL84 can replace them.
Power - Pentode (NOT beam)
The database records 45B5 as a possible replacement forUL84.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 45 V | 45 V |
| Heater current | 0.1 A | 0.1 A |
Where UL84 can be used as the replacement
In these recorded relationships, UL84 is the replacement tube. The listed original tubes are not automatically suitable as replacements for UL84.
Power - Pentode (NOT beam)
The database records UL84 as a possible replacement for45B5.
No special restrictions are recorded for this substitution.
| Specification | UL84 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 45 V | 45 V |
| Heater current | 0.1 A | 0.1 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 UL84 specifications →