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Tube Tinker — Electron Tube Database

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ECF801 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the ECF801 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.

Exact variations of ECF801

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.

  • 6GJ7

    Voltage Radio Detector Converter

    Base
    9QA
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    6.3 V
    Heater current
    0.45 A

Replacement tubes for ECF801

The following tubes are recorded as possible replacements for ECF801. This direction does not establish that ECF801 can replace them.

6GJ7

Voltage Radio Detector Converter

American To Foreign

The database records 6GJ7 as a possible replacement forECF801.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Triode PentodeVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9QA9QA
SocketB9AB9A
Base pins99
Sections22
Heater voltage6.3 V6.3 V
Heater current0.41 A0.45 A

Where ECF801 can be used as the replacement

In these recorded relationships, ECF801 is the replacement tube. The listed original tubes are not automatically suitable as replacements for ECF801.

6GJ7

Voltage Radio Detector Converter

Foreign To American

The database records ECF801 as a possible replacement for6GJ7.

No special restrictions are recorded for this substitution.

SpecificationECF801 replacementOriginal tube
Tube typeVoltage Triode PentodeVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9QA9QA
SocketB9AB9A
Base pins99
Sections22
Heater voltage6.3 V6.3 V
Heater current0.41 A0.45 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 ECF801 specifications →