I have four 805b's (bi-amping) with NOS RCA 211's on top and NOS GE's on the bottom. I never liked the KR tubes in my sterio. Having tried just about every 300B including new WE's, I have found that the Sophia on the top and JJ on the bottom works great. Also, I find that different input tubes (6SL7 in my amps or 6SN7's in later versions) make a huge difference in the sound of these amps.
Cannot comment on the 845 but it has to be better than regular Chinese tubes. The Sophia mesh plate I like very much. I would recomend putting the 845 and Sophia tubes in and then refining your sound by trying different NOS input tubes. Keven Deal at Upscale Audio has a good selection, a great ear and lots of experience tubing 805's. Give him a call.
Cannot comment on the 845 but it has to be better than regular Chinese tubes. The Sophia mesh plate I like very much. I would recomend putting the 845 and Sophia tubes in and then refining your sound by trying different NOS input tubes. Keven Deal at Upscale Audio has a good selection, a great ear and lots of experience tubing 805's. Give him a call.