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Tube Tinker — Electron Tube Database

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XCF801 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the XCF801 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.

Exact variations of XCF801

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.

  • 4GJ7

    Voltage Radio Detector Converter

    Base
    9QA
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    4.3 V
    Heater current
    0.6 A
  • 4GX7

    Voltage Radio Detector Converter

    Base
    Not recorded
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    4.2 V
    Heater current
    0.6 A

Replacement tubes for XCF801

The following tubes are recorded as possible replacements for XCF801. This direction does not establish that XCF801 can replace them.

4GJ7

Voltage Radio Detector Converter

American To Foreign

The database records 4GJ7 as a possible replacement forXCF801.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9QA9QA
SocketB9AB9A
Base pins99
Sections22
Heater voltage4.1 V4.3 V
Heater current0.6 A0.6 A

Where XCF801 can be used as the replacement

In these recorded relationships, XCF801 is the replacement tube. The listed original tubes are not automatically suitable as replacements for XCF801.

4GJ7

Voltage Radio Detector Converter

Foreign To American

The database records XCF801 as a possible replacement for4GJ7.

No special restrictions are recorded for this substitution.

SpecificationXCF801 replacementOriginal tube
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9QA9QA
SocketB9AB9A
Base pins99
Sections22
Heater voltage4.1 V4.3 V
Heater current0.6 A0.6 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 XCF801 specifications →