I have googled your kit and the DACs in particular seem to thin on the ground. How did you decide on them? Were you able to audition them?
Ah.. good question - firstly, no I wasn't able to audition the DACs. The Moon DAC is only available on eBay and is shipped from Hong Kong.
The reason that I chose it is because with most digital sources I've heard, I find I'm susceptible to so called "digital glare" that kind of grit in the sound especially the treble region, that some people associate with over-sampling designs - basically I find this a real distraction. Now I'm only talking about mid-range equipment - I have no experience with higher end stuff, eg Naim, Cyrus etc.
I heard about non-oversampling DACs and their supposedly Analogue sound and lack of digital nasties and googling came across the couple of similar DACs - like the Valab, I chose the Moon because it seemed to be better put together and just thought sod it I'll try one as a first time DAC - It only cost $200 around £130 delivered.
I originally used it with a Heed CanAmp and after about a day of use gave it a good listen - and was impressed it had a rich, warm sound and didn't hurt my ears but it was very noisy - the CanAmp picking up a lot of interference from it - so I dug out my old Headmaster which is very quiet, and was even more impressed as the grey flat sound I'd always associated with the Sugden had gone and been replaced by smooth, open and dynamic but very listenable sound that just drew me into the music, so it looked like NOS may be for me.
So I was after another DAC to feed my Stax system, originally I was considering a Benchmark but I eventually decided on another NOS model. I had first come across the Havana about six months ago while looking for Valve DACs - it seemed reasonably priced compared to others.
There is a thread on Head-fi concerning the Havana and some reviews on Mhdt's website. You can only buy it directly from the manufacturer either from their website or eBay store and it's shipped from Taiwan.
Admittedly it's a bit of a risk not being able to audition quite an expensive item but I'm glad I bought it because I'm very pleased with it - it's much more refined and detailed then the Moon and very quiet. In combination with the Stax the sound has an effortless quality, I really like the way it renders acoustic instruments, the timbre is very nice.
As I've mentioned before, the stock tube is a little bright, maybe in a couple of weeks time I'll try some different valves.
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"Silence is more musical than any song" - Christina Rossetti