424 MkIII problems


New member
Hello, I just bought a Tascam 424 MkIII off ebay, in almost unused condition.
Everything works great but there is one problem.

There is a clicking sound coming from the master fader periodically.

It's an irregular clicking, and the volume level of it is the same regardless of the volume of the individual tracks.
When turning down the master fader, the clicking gets lower in volume.
It does not matter whether I have dbx on or off.

The strange thing about this is that the problem almost always appears after I have recorded with it for a few hours. It never appears if I just record a few short recordings.

The heads have been cleaned and demagnetized and the problem is still there.

Any help with this?
What is the rate of the clicking sound? That description does not give too much to go on and it could also be mechanically related too.