BattousaiX26
100+ Head-Fier
I think both Mullards and Sylvania got very goods mids, but Mullards have a peak at 3kHz, while Sylvania are transparent and have great treble above 8kHz up to 18kHz (highest my ear could hear).
Also bass on both is pretty neat, though Mullards bass sounds like there is more of it, however Sylvania bass is deeper, goes nicely below 30Hz.
Bottom line, Sylvania more neutral, and thus more technically perfect.
I prefer Telefunkens for now, as they are very enjoyable.
Can you clarify why telefunkens are more enjoyable? How are the telefunkens vs mullards? I will be getting one for myself soon