Stick with what you already have. I have the same tubes as you in my Cary 211 FE mono’s and they are very reliable and dead quiet.
Best 845 tubes on market as of August 2023
Looking for reasonably well priced 845 tubes for my SET Mastersound 845 amp.
Currently have PS Vane ACME 845 on my Mastersound evolution
What are currently the best and most reliable internet sites to buy them?
What brands are currently well regarded. Price range 200-300 per tube.
I don't care much about sound signature, as long as they are quiet.
Also looking for decent 6SN7 and ECC82 for preamp section