Have you tried a passive with your SET? I am very impressed with the Lightspeed Attenuator (also have tried various TVC, AVC, and Placette)- after a few months of A/B with my Joule Signature Edition, I sold the Joule, which had been my favourite active preamp (after having owned ARC, CAT, Lamm, and Dodd tube linestages). This Mapletree fella, Dr. Peppard, does seem to have alot of knowledge about what is and isn't important for sound quality. At $800 with the Blackgate capacitor upgrade I felt I had to give it a shot. Have not heard anything negative from owners of his products. It seems that alot of audiophiles, as they get older, seek out simpler, a very common pattern.