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Tube Tinker — Electron Tube Database

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6X9 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6X9 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.

Exact variations of 6X9

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.

  • ECF200

    Voltage Triode Pentode

    Base
    Not recorded
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    6.3 V
    Heater current
    0.41 A

Replacement tubes for 6X9

The following tubes are recorded as possible replacements for 6X9. This direction does not establish that 6X9 can replace them.

ECF200

Voltage Triode Pentode

Foreign To American

The database records ECF200 as a possible replacement for6X9.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Triode PentodeVoltage Triode Pentode
ConstructionPentode-TriodePentode-Triode
BaseNot recordedNot recorded
SocketNot recordedB9A
Base pins109
Sections22
Heater voltage6.3 V6.3 V
Heater current0.41 A0.41 A

Where 6X9 can be used as the replacement

In these recorded relationships, 6X9 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6X9.

ECF200

Voltage Triode Pentode

American To Foreign

The database records 6X9 as a possible replacement forECF200.

No special restrictions are recorded for this substitution.

Specification6X9 replacementOriginal tube
Tube typeVoltage Triode PentodeVoltage Triode Pentode
ConstructionPentode-TriodePentode-Triode
BaseNot recordedNot recorded
SocketNot recordedB9A
Base pins109
Sections22
Heater voltage6.3 V6.3 V
Heater current0.41 A0.41 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 6X9 specifications →