tamburash007:

eventide stompboxes do not need regulated power supply.

Careful now. Eventide products have their own internal regulation, so they do not require external regulation. The issue is that an unregulated supply has a largely undefined output voltage. Depending on the product, anything over about 16v may cause damage. A 12v unregulated unit can exceed this under some circumstances. Bad thing ! For this reason, we and Lord Cooks recommend the use of regulated supplies.