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Tube Tinker — Electron Tube Database

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12S7 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 12S7 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.

Exact variations of 12S7

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.

  • UAF42

    Voltage Radio Detector Converter

    Base
    Not recorded
    Socket
    B8A
    Base pins
    8
    Sections
    2
    Heater voltage
    12.6 V
    Heater current
    0.1 A

Replacement tubes for 12S7

The following tubes are recorded as possible replacements for 12S7. This direction does not establish that 12S7 can replace them.

UAF42

Voltage Radio Detector Converter

Foreign To American

The database records UAF42 as a possible replacement for12S7.

  • Not suitable for all circuits
SpecificationOriginal tubeReplacement
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionDiode-PentodeDiode-Pentode
BaseOCTALNot recorded
SocketIOB8A
Base pinsNot recorded8
Sections22
Heater voltage12.6 V12.6 V
Heater current0.1 A0.1 A

Where 12S7 can be used as the replacement

In these recorded relationships, 12S7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12S7.

UAF42

Voltage Radio Detector Converter

American To Foreign

The database records 12S7 as a possible replacement forUAF42.

No special restrictions are recorded for this substitution.

Specification12S7 replacementOriginal tube
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionDiode-PentodeDiode-Pentode
BaseOCTALNot recorded
SocketIOB8A
Base pinsNot recorded8
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 12S7 specifications →