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Tube Tinker — Electron Tube Database

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ECF80 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the ECF80 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.

Exact variations of ECF80

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.

  • 6BL8

    Voltage Radio Detector Converter

    Base
    9DC
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    6.3 V
    Heater current
    0.45 A
  • 6LN8

    Voltage Radio Detector Converter

    Base
    9DC
    Socket
    B9A
    Base pins
    9
    Sections
    2
    Heater voltage
    6 V
    Heater current
    0.45 A

Replacement tubes for ECF80

The following tubes are recorded as possible replacements for ECF80. This direction does not establish that ECF80 can replace them.

6BL8

Voltage Radio Detector Converter

American To Foreign

The database records 6BL8 as a possible replacement forECF80.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typeVoltage Triode PentodeVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9C129DC
SocketB9AB9A
Base pins99
Sections22
Heater voltage6.3 V6.3 V
Heater current0.43 A0.45 A

Where ECF80 can be used as the replacement

In these recorded relationships, ECF80 is the replacement tube. The listed original tubes are not automatically suitable as replacements for ECF80.

6BL8

Voltage Radio Detector Converter

Foreign To American

The database records ECF80 as a possible replacement for6BL8.

No special restrictions are recorded for this substitution.

SpecificationECF80 replacementOriginal tube
Tube typeVoltage Triode PentodeVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9C129DC
SocketB9AB9A
Base pins99
Sections22
Heater voltage6.3 V6.3 V
Heater current0.43 A0.45 A
6HL8

Voltage Triode Pentode

Foreign To American

The database records ECF80 as a possible replacement for6HL8.

No special restrictions are recorded for this substitution.

SpecificationECF80 replacementOriginal tube
Tube typeVoltage Triode PentodeVoltage Triode Pentode
ConstructionPentode-TriodePentode-Triode
Base9C129AE
SocketB9AB9A
Base pins99
Sections22
Heater voltage6.3 V6.3 V
Heater current0.43 A0.6 A
6U8

Voltage Radio Detector Converter

Foreign To American

The database records ECF80 as a possible replacement for6U8.

No special restrictions are recorded for this substitution.

SpecificationECF80 replacementOriginal tube
Tube typeVoltage Triode PentodeVoltage Radio Detector Converter
ConstructionPentode-TriodePentode-Triode
Base9C129AE
SocketB9AB9A
Base pins99
Sections22
Heater voltage6.3 V6.3 V
Heater current0.43 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 ECF80 specifications →