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Tube Tinker — Electron Tube Database

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6CT7 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6CT7 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.

Exact variations of 6CT7

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.

  • EAF42

    Voltage Pentode or Tetrode (under 100V)

    Base
    NOVAL
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    6.3 V
    Heater current
    0.2 A

Replacement tubes for 6CT7

The following tubes are recorded as possible replacements for 6CT7. This direction does not establish that 6CT7 can replace them.

EAF42

Voltage Pentode or Tetrode (under 100V)

Foreign To American

The database records EAF42 as a possible replacement for6CT7.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Radio Detector ConverterVoltage Pentode or Tetrode (under 100V)
ConstructionDiode-PentodeDiode-Pentode
BaseOCTALNOVAL
SocketIOB9A
Base pins89
Sections22
Heater voltage6.3 V6.3 V
Heater current0.3 A0.2 A

Where 6CT7 can be used as the replacement

In these recorded relationships, 6CT7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6CT7.

EAF41

Voltage Radio Detector Converter

American To Foreign

The database records 6CT7 as a possible replacement forEAF41.

  • Not suitable for all circuits
Specification6CT7 replacementOriginal tube
Tube typeVoltage Radio Detector ConverterVoltage Radio Detector Converter
ConstructionDiode-PentodeDiode-Pentode
BaseOCTALRIMLOCK
SocketIORIMLOCK8
Base pins88
Sections22
Heater voltage6.3 V6.3 V
Heater current0.3 A0.2 A
EAF42

Voltage Pentode or Tetrode (under 100V)

American To Foreign

The database records 6CT7 as a possible replacement forEAF42.

No special restrictions are recorded for this substitution.

Specification6CT7 replacementOriginal tube
Tube typeVoltage Radio Detector ConverterVoltage Pentode or Tetrode (under 100V)
ConstructionDiode-PentodeDiode-Pentode
BaseOCTALNOVAL
SocketIOB9A
Base pins89
Sections22
Heater voltage6.3 V6.3 V
Heater current0.3 A0.2 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 6CT7 specifications →