Tube cross-reference
RK39 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the RK39 power - beam (not sweep). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for RK39
The following tubes are recorded as possible replacements for RK39. This direction does not establish that RK39 can replace them.
Power - Beam (NOT sweep)
The database records 807 as a possible replacement forRK39.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | 5AW |
| Socket | MEDIUM5 | 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 RK39 can be used as the replacement
In these recorded relationships, RK39 is the replacement tube. The listed original tubes are not automatically suitable as replacements for RK39.
Power - Beam (NOT sweep)
The database records RK39 as a possible replacement for807.
No special restrictions are recorded for this substitution.
| Specification | RK39 replacement | Original tube |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | 5AW |
| Socket | MEDIUM5 | 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 RK39 specifications →