Primaluna Diaglogue Premium Preamp Owners

If its anything like the integrated changing the tubes will definitely change the sound. The stock tubes will last forever as PL products are easy on tubes. The middle tubes make the most difference. What are you trying to achieve? More detail, less detail, etc....?

I have had a PrimaLuna Dialogue Premium Pre that fronts for a McIntosh SS amp and a pair of Martin Logan ESLs for a little over a year now.  I only used the stock tubes for about a month...  They sounded great after run-in but I have not used them since rolling in two 12AU7 1962 vintage MAZDA CIFTE tubes sitting in the drivers seat for the first gain stage, four 12AU7 Genalex Gold Lions in the second gain stage and cathode follower output stage and two Genalex Gold Lions 5AR4 rectifier tubes and AudioQuest power cable and interconnects.  In my system and in my room it sounds like magic.

What did the GL 12AU7 bring to the table? Are they much smoother than the stock PL tubes?

I feel that in my system, the GGLs bring higher highs and lower lows... Extension, resolution, speed and a tightness across the frequency range... The CIFTEs bring an edge, air and sparkle to the top... When everything comes together, in my listening space, I feel like I am in the venue the music was recorded in... Lush, rich, 3D and holographic...

Thanks for everyone's feedback.

I have not been a fan of the stock tubes mated to my XA30.5 power amp. The highs are a bit shrill for my liking so I've ordered some 60's Mullards to replace all 6. I don't know what PrimaLuna uses as stock tubes since they're rebranded but I'd rather just get them out of there. 

Has anyone replaced any caps in their unit? Space seems a bit tight but I can't find anything about DuRoch other than PrimaLuna uses them. I assume they're also rebranded something but in the world of caps I can't see them ranking very well.

All the parts of "premium" compared to most of the stock crap that's out there but in the DIY world most of them are moderate at best. The build quality of the amp is top-notch and overall I really enjoy the sound I'm getting. Don't know how it compares to a 6SN7 preamp, maybe one day I'll get one to find out!

Like Dsper, I replaced the first tubes with NOS Mullards, made a nice improvement in the midrange.

As for caps teh stock caps are SCRs from Solen. Many options aftermarket are available. I used the Jensen Copper Foil caps which makes the music sound much more organic than any other film caps I have tried.

The DuRoch caps are the SCR from Solen in the dialogue premium preamp? 

Which caps did you replace with the Jensens? They seem much bigger than the stock Mundorf EVO silver/gold caps.