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