It always surprises me how much difference tube rolling can make. If I put a miniwatt gz34 and 6ed7s in my Woo, then a 6n6p and EML 274b in my Sonett, the Sonett will sound more like the Woo than the Woo, if that makes any sense.
What are you using to drive the amp? Even though you don't have an outboard unit, there is a DAC chip somewhere. If it's something like a decent PC soundcard be prepared to be blown away by the improvement.
Make no mistake, this is a crazy good DAC. Even the quad, I imagine power filtration is more important than the number of chips. At this level of performance it's really about preference in sound. I can see folks interested in more typical NOS DACs not liking it, it's like some sort of weird hybrid. For me it's been an acquired taste but a taste I'm definitely acquiring
I just got back into HPs after a 5 year hiatus.
Lots of listening on the PC (X-fi sound card)/Sony Vaio driving my Pete Millett's SRPP amp =>T1 with ground taken off. Going balanced next week, just waiting for 4 pin XLR to show up. I was using my Wadia for sometime but found it a PITA changing CD's to listen to tracks so it's back into my HT system (Wadia=>Pioneer=> Proceed HPA-2=> Legacy Signature) and getting no use at all.
Going to the Sylvania and Tungsol 12BH7 made such a huge diff from the 12AU7s( Telefunken, Mullard. Amperex Bugle Boy and even the Genalex -old stock- now sold, some crazy guy from Taiwan paid me $350 for it) I can safely say I don't like the 12AU7 sound anymore, just too rounded, smaller sound stage and no extension but pleasant to listen to. I have a Tungstram E80CC and RCA BP's on the way which should be more fun as the sound I believe is diametrically opposite. I am at a stage I would be happy with just about any improvement brought on by the Metrum, but I know it's going to be substantial and then on top of that I can definitely tailor it to my liking with tube rolling. I did order the Quad with a separate 7A power supply. Just hoping it shows up in the next few weeks as I paid for it about 3 weeks ago.