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Tube Tinker — Electron Tube Database

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7971 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 7971 power - beam (not sweep). Compare core specifications and verify every restriction before using a replacement.

Exact variations of 7971

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.

  • CV4060

    NEW (being researched)

    Base
    Not recorded
    Socket
    Not recorded
    Base pins
    Not recorded
    Sections
    1
    Heater voltage
    Not recorded
    Heater current
    Not recorded
  • S11E12

    Power - Beam (NOT sweep)

    Base
    Not recorded
    Socket
    IO
    Base pins
    8
    Sections
    1
    Heater voltage
    6.3 V
    Heater current
    1.6 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 7971 specifications →