If you're going to change tubes I'd suggest first trying to replace the 12AX7s in the Jolida (assuming that you're currently running stock tubes). Power tubes are expensive to replace and must be biased, and besides, I believe the stock tubes in the Jolida are re-branded Valveart EL34Bs which are on the warm side already. For 12AX7 suggestions there are numerous NOS candidates with a warm signature (Mullard, etc.). There may be some new production tubes that will give you what want as well, like the New Sensor Mullard, although I haven't heard too many new production tubes (the Groove Tubes 12AX7M has a warm sound to it, although I'm not sure if it's still in production).
Because tube rolling a pair of 12AX7s can be done for under $100 I'd suggest trying this before adding a sub. If you like what you hear you can always try further tube rolling with EL34s or 12AT7s to maximize your current gear.
Good luck.
Because tube rolling a pair of 12AX7s can be done for under $100 I'd suggest trying this before adding a sub. If you like what you hear you can always try further tube rolling with EL34s or 12AT7s to maximize your current gear.
Good luck.