I can, highly recommend TAD, pre & power valves. Check the website, as they do some lower gain pre amps, (I forget the P/No), similar to Mullards & GE's of yesteryear. Or, go the whole hog & buy, N.O.S. makes, which is , very expensive, & No guarantee of quality. I've used N.O.S stuff for 20 odd years, but noticed the good stuff is mostly gone now.(I rejected, three batches, I ordered, which Included, RCA, Mullard, & GE's) Which is why, I started experimenting with, current production valves, none of which sound as good as the N.O.S valves, but,or last as long. Q.C. & Sonics are Improving, every few years.