Tube cross-reference
512AX alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 512AX voltage pentode or tetrode (under 100v). Compare core specifications and verify every restriction before using a replacement.
No alternatives recorded
Tube Tinker does not currently have an exact variation or directional substitution recorded for 512AX.
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 512AX specifications →