Tube cross-reference
6A4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6A4 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6A4
The following tubes are recorded as possible replacements for 6A4. This direction does not establish that 6A4 can replace them.
Power - Pentode (NOT beam)
The database records 6A4LA as a possible replacement for6A4.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 5B | 5 |
| Socket | UY5 | UX5 |
| Base pins | 5 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 6A4 can be used as the replacement
In these recorded relationships, 6A4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6A4.
Power - Pentode (NOT beam)
The database records 6A4 as a possible replacement for6A4LA.
- Not suitable for all circuits
| Specification | 6A4 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 5B | 5 |
| Socket | UY5 | UX5 |
| Base pins | 5 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 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 6A4 specifications →