Tube cross-reference
44 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 44 voltage pentode - remote cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 44
The following tubes are recorded as possible replacements for 44. This direction does not establish that 44 can replace them.
Voltage Pentode - Remote Cutoff (single)
The database records 39 as a possible replacement for44.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | 5F | 5F |
| Socket | UX5 | UX5 |
| Base pins | 5 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 44 can be used as the replacement
In these recorded relationships, 44 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 44.
Voltage Pentode - Remote Cutoff (single)
The database records 44 as a possible replacement for39.
No special restrictions are recorded for this substitution.
| Specification | 44 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | 5F | 5F |
| Socket | UX5 | UX5 |
| Base pins | 5 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 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 44 specifications →