Tube cross-reference
6S4A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6S4A power - tv vertical output. Compare core specifications and verify every restriction before using a replacement.
Where 6S4A can be used as the replacement
In these recorded relationships, 6S4A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6S4A.
Power - TV Vertical Output
The database records 6S4A as a possible replacement for6S4.
No special restrictions are recorded for this substitution.
| Specification | 6S4A replacement | Original tube |
|---|---|---|
| Tube type | Power - TV Vertical Output | Power - TV Vertical Output |
| Construction | Triode | Triode |
| Base | EIA 9AC | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 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 6S4A specifications →