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Tube Tinker — Electron Tube Database

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QQV0640A alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the QQV0640A power - beam (not sweep). Compare core specifications and verify every restriction before using a replacement.

Exact variations of QQV0640A

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.

  • 5894

    Power - Tetrode (NOT beam)

    Base
    Not recorded
    Socket
    SEPTAR7
    Base pins
    7
    Sections
    2
    Heater voltage
    12.6 V
    Heater current
    0.9 A
  • AX9903

    NEW (being researched)

    Base
    Not recorded
    Socket
    Not recorded
    Base pins
    Not recorded
    Sections
    1
    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 QQV0640A specifications →