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.
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.