Reading through the rest of the thread, I have decided to try alternatives to the standard "upgraded" EH tube. At the moment I only have 2 tubes to compare, the EH and a Mullard ECC88, Made in Holland. I should eventually receive the Amperex, much look forward to that one as well.
Having recently purchased a higher-end amp, I am only using the Aune T1 now as a DAC. In the absence of other options, I think it's doing a decent job.
After a bit of tube rolling with the 2 above, I am not at all impressed with the default EH and I think there's a lot that the Mullard does better, such as detailing, instrument separation, better quality bass. I may update this with further observations as I get past the burn-in stage.
In summary I would describe Mullard as engaging whereas when I switch back to the EH it's a bit flat and dull.
Edited by negura - 2/10/13 at 11:01am