BAT VK-55 monoblock retube


I am contemplating retubing my 55's. Do I replace with original tubes (Tube Man) or something else? Can I / should I use 55SE tubes? Could use some good advice. Thank you,
bgmyers
for what it is worth, I bought a used VK-55 the other day that came with some vintage green label Sylvania 6SN7's and the previous owner said these sounded better than the stock Sovtek's.
For my 55 mono's I buy my 6C33's from Partsconnexion and the 6SN7/ 68HC where I can get a good price. Sylvania's are a good tube as well as the Raytheon. I drive "hot rodded" Soundlabs and the Raytheon 6SN7's are my preference.