I lifted this from the product review forum in the Acoustat amp. thread for you.
Review: Acoustat TNP
Not that it was worth it, resale is nothing on it, but for the heck of it I decided to mod a TNP preamp. After hearing a plethora of disparaging comments about it, and assuming that it was not such a horrid design after all... Well, I was completely right, the original caps and bypass caps used in the TNP suck, use RT or RTX caps for bypassing, and Black Gates in the signal path, and Nichicon Muse caps in the supply, replace the 1N400(X) cap with UF4007s and this preamp will hold its own against the big dogs, and smoke the later Acoustic preamp, unless you mod it! :-) I did not do the phono section as I just wanted to prove a point, and as I had wasted quite enough money on it. If I was not crazy about remotes, I would use it