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Tube Tinker — Electron Tube Database

Tube cross-reference

24A alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 24A voltage tetrode. Compare core specifications and verify every restriction before using a replacement.

Replacement tubes for 24A

The following tubes are recorded as possible replacements for 24A. This direction does not establish that 24A can replace them.

35

Voltage Tetrode

Receiving Tubes

The database records 35 as a possible replacement for24A.

  • Not suitable for all circuits
SpecificationOriginal tubeReplacement
Tube typeVoltage TetrodeVoltage Tetrode
ConstructionTetrodeTetrode
Base5E5E
SocketUX5UX5
Base pins55
Sections11
Heater voltage2.5 V2.5 V
Heater current1.75 A1.75 A

Where 24A can be used as the replacement

In these recorded relationships, 24A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 24A.

35

Voltage Tetrode

Receiving Tubes

The database records 24A as a possible replacement for35.

  • Not suitable for all circuits
Specification24A replacementOriginal tube
Tube typeVoltage TetrodeVoltage Tetrode
ConstructionTetrodeTetrode
Base5E5E
SocketUX5UX5
Base pins55
Sections11
Heater voltage2.5 V2.5 V
Heater current1.75 A1.75 A
51

Voltage Tetrode

Receiving Tubes

The database records 24A as a possible replacement for51.

  • Not suitable for all circuits
Specification24A replacementOriginal tube
Tube typeVoltage TetrodeVoltage Tetrode
ConstructionTetrodeTetrode
Base5E5E
SocketUX5UX5
Base pins55
Sections11
Heater voltage2.5 V2.5 V
Heater current1.75 A1.75 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 24A specifications →