Tube cross-reference
4Y25 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4Y25 power - tetrode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 4Y25
The following tubes are recorded as possible replacements for 4Y25. This direction does not establish that 4Y25 can replace them.
Power - Beam (NOT sweep)
The database records 807 as a possible replacement for4Y25.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Tetrode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Tetrode | BeamPower |
| Base | Not recorded | 5AW |
| Socket | Not recorded | UX5 |
| Base pins | Not recorded | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.9 A |
Where 4Y25 can be used as the replacement
In these recorded relationships, 4Y25 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4Y25.
Power - Beam (NOT sweep)
The database records 4Y25 as a possible replacement for807.
No special restrictions are recorded for this substitution.
| Specification | 4Y25 replacement | Original tube |
|---|---|---|
| Tube type | Power - Tetrode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Tetrode | BeamPower |
| Base | Not recorded | 5AW |
| Socket | Not recorded | UX5 |
| Base pins | Not recorded | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.9 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 4Y25 specifications →