Marty, I am using new production Cetron 845 tubes in my 211 AE's and I switch between the Sophia Mesh Plate and the Sophia Carbon Plate for my 300B tubes. No way can I afford the NOS 845s and I found that the new production WE 300B were crap. I have not tried the Sophia 845s but I do highly recommend their 300B tubes. Those are great amps. I love mine.