Hi,
But all is not lost, while the micro iDSD has neither the battery current nor the circuit board space to include the ‘Tubestate®’ circuit, in its place there is a (Burr Brown ‘SoundPlus®’) Op-Amp, one of the best you can get and close in character to the Tubestate® circuit, but just not quite as warm, ‘tubey’ sounding.
Thanks God, in name of all the ones which just wants the sound which is actually recorded in the audio tracks, to be reproduced.
And not a even-harmonic-distorted, though pleasing to some, version of it.
Hi,
Please allow us to explain further:
With respect, adding oodles of even order harmonics is not what Tube State (or even our real tube circuitry) is about. It is true this is quite prevalent in the <$1,000 segment of the audio market where quite a few companies do not do truly high-end stuff (with respect). Some people try to emulate 'Tube Sound' by just adding distortion. The result invariably is an unrealistic dummy sound, nothing like real tubes. We agree this goes on with some companies that just make tubes but never really went 'all out.'
But this is not what we do. With the AMR background, iFi thinks and works a little different. And yes, for measurements people, they can have their cake and eat it too.
ClieOS measured the iCAN (with tubestate Circuit) in his review:
http://www.inearmatters.net/2013/04/impression-ifi-audio-idac-ican-iusb.html
He explained "In fact, iCAN performance has excessed the resolution of my measuring setup so it looks pretty much perfect."
He also tested the iTube:
http://www.inearmatters.net/2013/08/impression-ifi-audio-itube-magic-infused.html
His comments on how it measured compared to iCAN alone: "we are talking about 0.001% of difference in THD and 0.004% in IMD+Noise, plus less than 2dBA in overall noise level."
Neither the Tube State circuitry in the iCAN micro nor the Tube in the iTube produce much distortion, noise or other objectively measurable additions of any kind.
By the way, the same holds true for the iCAN Pro. We clocked that at 'tripple zero' levels of THD (meaning 0.000X% THD) in tube mode and 126dB ( A ) Signal/Noise ratio, in single-ended mode (THD is less in balanced mode). Remember, that is in TUBE mode. So nope, we don't do the usual 'chuck loads at it' thing.
This is the AMR pedigree which means we do handle tubes/valves in an unconventional manner.