Tube cross-reference
45B5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 45B5 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 45B5
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.
UL84 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 45B5
The following tubes are recorded as possible replacements for 45B5. This direction does not establish that 45B5 can replace them.
Power - Pentode (NOT beam)
The database records 10P18 as a possible replacement for45B5.
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 |
Power - Pentode (NOT beam)
The database records UL84 as a possible replacement for45B5.
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 45B5 can be used as the replacement
In these recorded relationships, 45B5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 45B5.
Power - Pentode (NOT beam)
The database records 45B5 as a possible replacement for10P18.
No special restrictions are recorded for this substitution.
| Specification | 45B5 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 |
Power - Pentode (NOT beam)
The database records 45B5 as a possible replacement forUL84.
No special restrictions are recorded for this substitution.
| Specification | 45B5 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 45B5 specifications →