Snooker14, What power tubes are you using now? What kind of music do you listen? Which you prefer? Oil caps in your SLI80? I ask so that the advise will fit better to your taste and setup.
I use KT88s in my Rocket-88 and have tried JJ Tesla and Svetlana SED(c) logo. I have found the Svetlana softens the top a bit and enhances the midrange with less bottom end compared to the JJs that have a more balanced presentation but can sound bright in the wrong setup. I prefer the Svetlana sonic signature. This is a listener speaking not an expert.
I use KT88s in my Rocket-88 and have tried JJ Tesla and Svetlana SED(c) logo. I have found the Svetlana softens the top a bit and enhances the midrange with less bottom end compared to the JJs that have a more balanced presentation but can sound bright in the wrong setup. I prefer the Svetlana sonic signature. This is a listener speaking not an expert.