Tube cross-reference
UL41 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the UL41 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of UL41
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.
45A5 Power - Pentode (NOT beam)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Replacement tubes for UL41
The following tubes are recorded as possible replacements for UL41. This direction does not establish that UL41 can replace them.
Power - Pentode (NOT beam)
The database records 45A5 as a possible replacement forUL41.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B8A | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 45 V | Not recorded |
| Heater current | 0.1 A | Not recorded |
Where UL41 can be used as the replacement
In these recorded relationships, UL41 is the replacement tube. The listed original tubes are not automatically suitable as replacements for UL41.
Power - Pentode (NOT beam)
The database records UL41 as a possible replacement for45A5.
No special restrictions are recorded for this substitution.
| Specification | UL41 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B8A | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 45 V | Not recorded |
| Heater current | 0.1 A | 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 UL41 specifications →