• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Is fixing microphonics as simple as replacing tubes?

Tubes are microphonic in general.

Im more use to tubes in high vibration conditions
or portable applications.
So the spacers inside get loose over time so it is a very
sharp metal ping ! when you tap the tube.

And yes at that point, tube gets replaced.
No way to fix the loose parts inside.

Just what im use too, any tube can make little thump thump
or tap tap sound.
It is more a hard metallic ping or rattle when
the spacers are loose or damaged. More common in portable
stuff.