Wonder if your device will be having the "ringing" issue - I know of a couple people who have recently bought a Pathos from our local dealer (in Portugal) and they say the newer units do not suffer from that issue at all any more, they don't have a demo unit at the store however (they only get stock on order) and I'd like to be sure there's no ringing before I purchase mine seeing as a lot of my headphones are fairly sensitive and low impedance. I'm extremely sensitive to noise and tinnitus-type stuff so it'd be a deal breaker for me unfortunately. Please do let us know if yours is flawless, I'm hoping (almost expecting) it will be, for your sake as well as my own. This is a beautiful amplifier and I'm sure it sounds wonderful. Regarding tubes, Upscale is super reliable and accountable, I rather spend more per tube there than go on ebay as a total newcomer to valves and end up spending 10 times as much because I have no idea what I'm buying and what condition it's in, etc. Wondering if my iFi NOS would perform well with the Aurium, I'm assuming they'd work as they are 6922s.