Tube cross-reference
50FK5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 50FK5 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 50FK5
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.
50FA5 Power - Pentode Single (NOT beam) (under 10W)
- Base
- 7CV
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 40 V
- Heater current
- 0.1 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 50FK5 specifications →