conrad-johnson ET7-S2 line preamplifier

Although we are one of the keenest magazines to get conrad-johnson products into print, sometimes it’s hard to keep up. We reviewed the original ET7 in February 2018 (Issue 156) and a year or so later, conrad-johnson improved the ET7 to ET7-S2 status, the product tested here. The changes are both physically and sonically significant, moving the ‘baby GAT’ ever closer to the performance of its bigger GAT Series 2 brother. To recap (there is a pun in there, watch this space), that ‘ET’ prefix to the name means ‘Enhanced Triode’ because the circuit uses a single 6922 double triode …