After building the Quickie and upgrading caps, resistors , Nos tube sockets and RCA`s I must say after almost 50 years in this hobby I`m blown away. ( I was hooked when I was 8 and my father brought home a 10 WPC Lafayette tube amp, Criterion speakers and a Garrard turntable) Now, 52 years later I`m just as hooked on the Quickie. It`s beaten my Forte model 40, PS Audio 4.5 and PS audio SP 100 by a wide margin. Speakers used are Maggie MMG, Dalquist DQ 20 and Cain and Cain Abby. Huge improvement on all of them. I`m stunned at times at just how this can be happening but it is. Now my question,,,, I now have 3 preamps that don`t want to use and want to build another Quickie . I have all the parts but want to know if I can use a simple switch from RS. I`m only using 1 input but the more I look at the wires and instructions the more confused I get. Anyone can chime in? Also a HUGE thank you to the guys/ gals who engineered this preamp. You did an old dude a huge favor!!!!!! Tom H