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Tube Tinker — Electron Tube Database

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UAF42 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the UAF42 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.

Exact variations of UAF42

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.

  • 12S7

    Voltage Radio Detector Converter

    Base
    OCTAL
    Socket
    IO
    Base pins
    Not recorded
    Sections
    2
    Heater voltage
    12.6 V
    Heater current
    0.1 A

Replacement tubes for UAF42

The following tubes are recorded as possible replacements for UAF42. This direction does not establish that UAF42 can replace them.

12S7

Voltage Radio Detector Converter

American To Foreign

The database records 12S7 as a possible replacement forUAF42.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionDiode-PentodeDiode-Pentode
BaseNot recordedOCTAL
SocketB8AIO
Base pins8Not recorded
Sections22
Heater voltage12.6 V12.6 V
Heater current0.1 A0.1 A

Where UAF42 can be used as the replacement

In these recorded relationships, UAF42 is the replacement tube. The listed original tubes are not automatically suitable as replacements for UAF42.

12S7

Voltage Radio Detector Converter

Foreign To American

The database records UAF42 as a possible replacement for12S7.

  • Not suitable for all circuits
SpecificationUAF42 replacementOriginal tube
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionDiode-PentodeDiode-Pentode
BaseNot recordedOCTAL
SocketB8AIO
Base pins8Not recorded
Sections22
Heater voltage12.6 V12.6 V
Heater current0.1 A0.1 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 UAF42 specifications →