Tube cross-reference
7728 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7728 voltage - dual triode (similar). Compare core specifications and verify every restriction before using a replacement.
Where 7728 can be used as the replacement
In these recorded relationships, 7728 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 7728.
Voltage - Dual Triode (similar)
The database records 7728 as a possible replacement for12AT7.
No special restrictions are recorded for this substitution.
| Specification | 7728 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | E9-1 / 9A | 9A |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 12.6 V |
| Heater current | 0.3 A | 0.15 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 7728 specifications →