I'm glad you think EF86 sounds good too with EL12N. So it's not a figment of my imagination. EF86 somehow has less gain on Euforia. Try EF80. More gain and cheaper. It's a win win. EL12N is a real gem. For the price, it's a frigging good power tube. Sounds good as a driver too. I have no such luck with EL12 though. My latest acquisition of a single Telefunken EL12 NOS at EUR83.90 died after barely 4 hours of listening. 4 blissful hours when it sounded very good paired with my other Telefunken EL12 as power tubes and EL12N as drivers. This tube (along with my other EL12s) were purchased from WEGE-High-Fidelity. It died in the middle of a song and the light went out. No sound and light from that channel. I can't remember the song but it could have been 'Stairway to heaven' by Led Zeppelin. The tube was advertised as NOS and guaranteed. It didn't look that new to me to be honest. So whilst I can heartily recommend EL12N because it's cheap and good, I can't really say the same about EL11 and EL12.