Tube cross-reference
6S4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6S4 power - tv vertical output. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6S4
The following tubes are recorded as possible replacements for 6S4. This direction does not establish that 6S4 can replace them.
Power - TV Vertical Output
The database records 6S4A as a possible replacement for6S4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - TV Vertical Output | Power - TV Vertical Output |
| Construction | Triode | Triode |
| Base | Not recorded | EIA 9AC |
| 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 6S4 specifications →