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Tube Tinker — Electron Tube Database

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ECF200 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the ECF200 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.

Exact variations of ECF200

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.

  • 6X9

    Voltage Triode Pentode

    Base
    Not recorded
    Socket
    Not recorded
    Base pins
    10
    Sections
    2
    Heater voltage
    6.3 V
    Heater current
    0.41 A

Replacement tubes for ECF200

The following tubes are recorded as possible replacements for ECF200. This direction does not establish that ECF200 can replace them.

6X9

Voltage Triode Pentode

American To Foreign

The database records 6X9 as a possible replacement forECF200.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Triode PentodeVoltage Triode Pentode
ConstructionPentode-TriodePentode-Triode
BaseNot recordedNot recorded
SocketB9ANot recorded
Base pins910
Sections22
Heater voltage6.3 V6.3 V
Heater current0.41 A0.41 A

Where ECF200 can be used as the replacement

In these recorded relationships, ECF200 is the replacement tube. The listed original tubes are not automatically suitable as replacements for ECF200.

6X9

Voltage Triode Pentode

Foreign To American

The database records ECF200 as a possible replacement for6X9.

No special restrictions are recorded for this substitution.

SpecificationECF200 replacementOriginal tube
Tube typeVoltage Triode PentodeVoltage Triode Pentode
ConstructionPentode-TriodePentode-Triode
BaseNot recordedNot recorded
SocketB9ANot recorded
Base pins910
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 ECF200 specifications →