Archive of the former Yahoo!Groups mailing list: Mellotronists

I have found that removing the headblock to demagnetize is not
necessary. But, if you should do so, be sure to short across the
contacts of the receiver plug at the back of the preamp box before
you plug the headblock back in or you run the risk of magnetizing
the headblock all over again... and the correct procedure is to only
demagnetize one head at a time.\u000f
\u000f
Unless of course you have a really big one (ooh missus!) like JB, in
which case you can do the whole headblock in one swoop.