I'm looking for advice on the best (sonically) way to add a balance control to my type 26 (or the 01A) pre. My room has an imbalance, no matter what amp or speakers I use, so I need to balance the pre. The speakers can't be moved, nor the room altered, so this is only reasonable way forward. As both pre-amps have two central knobs on the front (volume and source) a pair of small knobs, one each side, would work best visually. 100k TKD pot on the 26, 100k PEC on the 01A. I've seen the John Broskie design; is that an acceptable method? One switch each side. Depending on the quality of the components of course.They're Here & More Sonic Control