I've got a mcintosh mx110 that's been sitting ...

It's original z series ...
In use just over 16 months ago...
Sounded greAt then ... I appreciate all input
Thanks brett

If this is an original MX 110 and the filter capacitors in the power supply have not been replaced, I would be careful running the preamp- startup on a variac and take and hour to bring it to full voltage- but I would regard its use as very temporary until the caps are replaced.

The power transformer is what is at risk, but certainly in any event the preamp will not sound its best, even if it seems to sound OK.

One year sitting won't hurt the capacitors. You should be able to power it on with no problem. However, if you are nervous. Take it to a repair shop and ask them to power it on with a variac.

enjoy

If I had a variac I would use it, better safe than sorry and it can't hurt anything.