For sale: Stax SRM-727A Electrostatic Amplifier for Stax SR-007 SR-009 & othersThis is a Japanese 100v model but I am including transformer to convert. These are very well made and around $60 by itself.The unit is in a great shape, lightly used but otherwise works perfectly. I  tried it in few different stax models and it powers it with ease.I even used it for 4 hrs straight, it gets warm but not as much that you cant put your hand on it (not that you should!)It works with either xlr's in or rca's in from a dac. very simple use as you know :)Please ask questions before biddingthank you