I am not a fan of the JJ tubes but I would wait until you have many hours on the preamp so you can really judge what you want to improve by tube rolling.
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Enjoy! I’ve got a Musica BellaMax - a precursor. Not only do the tubes need to break-in, but also the capacitors. They can easily take 200 hours or more - depending on the make. Musica Bella preamps are very responsive to all tweaks: tube rolling, fuses, power cords, interconnects, vibration control, etc. Take your time to discover what works best for your ears. It’s normal for signal tubes on preamps to be slightly warm. It’s the output tubes on amps that can heat a room.
" Thanks everyone. I don’t know much about tubes but do they need break in time also? I am looking for a smooth top end and more weight to the bass. Maybe some amperex also? "
in looking back, you have had tube preamp before ?
if you want to get some different tubes, give Andy a call at Vintage Tube Services and tell him what you are looking for.....he will gladly help you .
Based on another 6922 thread just dropped in some Matsushita / National 7DJ8's in my preamp and they sound fantastic. Got them from Upscale Audio $35 each for Platinum Grade. The thread I'm referencing is here:
Have fun and happy tube rolling!
I have the solid state power supply. I really like this preamp so far. It is still breaking in and soundstage seems to be expanding and it is becoming more laid back but still very nice detail. I have been looking for different tubes online and talked with Brent Jesse but I would like to talk with Andy also, thanks
this preamp keeps getting better and better. I still have the stock jj tubes and am about ready to try some mullard tubes. This pre is slightly on the warm side and laid back sounding, which is good for my system. I can listen for hours without any fatigue. I don't understand why musica bella products don't get talked about more on the forum. I payed a little more for this pre than my previous ps audio pre and it is much more refined and natural sounding than the ps audio(which is also still a nice pre).
My Musica BellaMax uses 12AU7 tubes. This model is definitely more on the neutral side than warm. Perhaps, that’s because of the V-Caps. I found the Mullards to be sumptuous in the mids but lacking in the HF or LF. Not my cup of tea. If your preamp signature is already warm, I recommend trying Le Radio Technique 6922’s - if you can find them. Less warm, great dynamics. I agree about the quality of Musica Bella products. Bill Baker knows what he’s doing. He also upgraded the x-overs on my speakers. Huge improvement!