Tube cross-reference
5U9 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5U9 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 5U9
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
LCF201 Voltage Triode Pentode
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 2
- Heater voltage
- Not recorded
- Heater current
- Not recorded
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 5U9 specifications →