Tube cross-reference
4X250B alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4X250B power - tetrode (not beam) (over 1000v 100w). Compare core specifications and verify every restriction before using a replacement.
Where 4X250B can be used as the replacement
In these recorded relationships, 4X250B is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4X250B.
Power - Beam (NOT sweep)
The database records 4X250B as a possible replacement for6979.
No special restrictions are recorded for this substitution.
| Specification | 4X250B replacement | Original tube |
|---|---|---|
| Tube type | Power - Tetrode (NOT beam) (over 1000V 100W) | Power - Beam (NOT sweep) |
| Construction | Tetrode | BeamPower |
| Base | Not recorded | Not recorded |
| Socket | B8G | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6 V | 6 V |
| Heater current | 2.1 A | 2.6 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 4X250B specifications →