Quoted from jrpinball:

We've been down this path before. My main objection to high-tapping is that it increases the voltage (force) on everything in the game (not the lamps in *most* cases) . If high-tap only increased voltage to the gameplay components, I wouldn't be so averse to doing it. It seems that some believe that changing the transformer tap will magically overcome gummy and worn components and make a game play like new again when in fact you're only doing harm to the game. Just about every modern home environment has adequate line voltage, making the intended purpose of high-tapping irrelevant. I've been to shows where because of the load on the electrical power supply, EM games play sluggishly, and some early SS games won't boot up or have flickering displays and such. In those cases, yes, change to high-tap.