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Problem ----------- I used to be a very happy owner of a Prima Luna Prologue II amp for which I managed to find the best damn tube combination (after months of rolling & rolling) which made the amp just sing every time I turned it on. However, despite its musicality and all the goodness it offered, I had one gripe with this amp. The lack of a remote. (I believe that this is simply human nature where we are never forever happy and at rest with certain things no matter how hard we try) This made me go for a Prima Luna Dialogue Premium Integrated. Now this amp is a beast.. weighing just above 50kg and looking as stunning as a valve amp can be. And guess what, It has a remote. One hell of a remote... I'm sure you can already guess where I'm going with this. Despite all the new features and looks and what not, the Tube arrangement is vastly different with the new amp and even after quite a lot of rolling attempts and various changes, I still have not had a combination of tubes which could even come close to that of my previous amp. Prima Luna Prologue II employs 2 x 12AX7 + 2 x 12AU7 in the pre section and 4 x EL34/KT88/KT120/etc. in the driver section. Prima Luna Dialogue Premium Integrated employs 6 X 12AU7 in the pre section and 4 x EL34/KT88/KT120/etc. in the driver section. I'm at a dilemma whether I should keep the new one and sell the old or keep the old one and sell the new Questions ------------- Can anybody give suggestions to how the Pre section of the Dialogue Premium is arranged ? (i.e. the internal structure of tubes and how they affect the sound of the amp) Has anybody found a good combination of tubes for the Dialogue Premium amplifier which can make it sound as it should ? Can 12AU7 be interchanged with 12AX7 ? And BTW, the winning tube combo in my Prologue II is as below. Those who have this amp, Please give it a try and see what I mean... 2 x 12AX-7 = Telefunken Smooth Plate (Selected Tube) 2 x 12AU-7 = Brimar CV 4034 (Purchased from Tubemonger who has the tooling to create matching bases that would go into the 12AU7 socket) 4 x EL-34 = Svetlana Winged C (NOS). (I tried a quad of Mullard EL-34 XF2 NOS with the above pre tubes but the Svetlanas sound waayyyy better with them) All Opinions are welcome Cheers....