So... I cancelled my O2 amp order and got a Little Dot Mk3
The amp came with RTC 5654 + the stock 6H6PI power tubes
Immediately on listening using my DT880 600 ohm (with no burn in time for the amp) I think the amp has improved the sound in all aspects: detail, soundstage, bass quality and quantity..
Hopefully the amp gets better and better from here, but I am quite happy with the sound I am getting so far.
The one thing I was not happy with would be the noise floor - there is a bit more background noise now.
(I also notice that the background noise is highly evident when the DX90 screen is on)
Obviously DT880 600ohm driven with the tube amp is definitely expected more enjoyable than the built in amp of DX90 IMO, but we never know until we pair it up eh?
Next step for me would be to go into CV4010 M8100 Mullards when I get the "upgrade bug" again, eventually.
Loving the music..
Edited by philiptw - 5/13/14 at 10:47am