For Sale: APC Line-R 1200 Voltage Regulator - as new, in box. Can be set to maintain continuous voltage of 110v, 120v or 127v. I have two of them. I used the other one to supply a 1958 Eico amplifier with 110v (thus, as a voltage attenuator). The amp ran considerably cooler and quieter at the lower voltage. This unit (the one for sale here) was used briefly to power a guitar amplifier. Located in Vic West.