Tube cross-reference
6KU8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6KU8 voltage pentode or tetrode (with diode). 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 6KU8.
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 6KU8 specifications →