micro – iTube2

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General Electric 5670

3 sonic signatures to
select best of tube amps

Latest iteration of
3D+ and XBass+

Exceptional parts quality

Heart of the iTube2 First time ever to select SET,
Push-Pull or Classic
Both Analogue Signal Processing
circuits new and improved
ELNA Silmics and
TDK C0G capacitors

The original iTube became the ‘go to’ tube buffer for any and every home audio system. We have redesigned the micro iTube2 with new parts and new circuitry using trickle-down technology from the flagship ‘Pro’ series. Only the GE5670 tube remains.

The micro iTube2 is a tubed output stage, tube preamp, tube buffer AND an impedance-matching device all in one. There is nothing like it. You can put the micro iTube2 before a solid-state preamp and another one after it, creating the effect of tubing the whole audio chain. Or you can choose to simply use the micro iTube2 as a very high-quality preamp by itself.

The micro iTube2 sounds by and far, like a tube amplifier ‘done right with the inimitable magic of tubes.‘ Tonality and heft, especially in the mid-range and bass frequencies are increased to elevate the whole audio system from $100k to $1k. The micro iTube2 injects a serious does of tube magic into any audio system.

  ‘Magic’ of SET, Push-Pull or Classic Tube sound
In the ‘magic of tubes’ listening stakes, the iTube2 offers the listener the choice of different key sonic signatures:

– a Single-Ended Triode power amplifier;
– a Push-Pull tube power amplifier;
– a classic tube amplifier.

Just to note from the iFi team – there is no ‘right’ setting. We advise you to set according to your systems synergy and your listening preferences.

  XBass+® matrix for Speakers, new and improved
XBass+® for Speakers is quite different to its sister technology XBass+® for Headphones. The only similarity is in philosophy as the ability to enhance your Speaker listening is quite different to enhancing Headphone listening.

The former gives each and every audio system adjustable levels of bass control to enhance listening enjoyment through speakers that have limited bass extension. We have taken great care to ensure no degradation in sound quality occurs.

20 Hz (6dB): For speakers missing only the lowest bass notes (below 40Hz).
20 Hz (12dB): For speakers missing some bass notes (below 80Hz).
OFF: XBass+ switched out.
  3D Holographic+® matrix for Speakers
The latest 3D Holographic+ matrix for Speakers offers something quite special. It takes high-end systems to another level of performance. It was drawn from the original ground-breaking work of Alan Blumlein, the ‘father of stereo.’

Firstly, it corrects the fundamental spatial distortion in recordings. And secondly, it increases the width of the soundstage beyond that of the speaker placement.

  30˚+ This matrix adds an extra 30˚ to redress the narrow placement of speakers (eg either side of a PC monitor).
  + This matrix recreates original ‘width’ of the soundstage and is the recommended DEFAULT setting.
  Off 3D+ switched out.
  Brand-new PCB, Direct-Coupled for purest signal path
The iTube2, in-line with the latest iFi products, is ‘Direct-Coupled.’ This means no output coupling capacitor for the purest, most direct signal path.
  Furthermore, the iTube2 is virtually a whole new product as the circuitry and components have been radically changed and it now is more closely connected to the Pro iCAN. Trickle-down from flagship range? A definite “yes!”
  Reference class parts quality
The iTube2 employs Japan TDK C0G type capacitors. These are complimented by Japan Panasonic ECPU Film Capacitors explicitly designed for audio use with extremely low distortion (<0.00001% @ 1V/10kHz).

The iTube 2 also uses ELNA SIlmic capacitors. These and other parts are only found in components with an extra ‘0’ to the price.

The proof is in the listening. The best tube buffer/pre-amp out there just pulled even further ahead.
  Running silently in the background – iPower 15v
Every iTube2 comes with the very-new iPOWER (15v) which is a remarkable-quiet, advanced DC power supply that features:
Active Noise Cancellation+® drawn from military radar technology
12-Element Output Array/6-Element Input Array
Measured on the Audio Precision 2, the iPower has an astonishingly low audio band noise floor of just 1uV while it has the ability to power the iTube2 to put out a maximum 7.75v which is quite remarkable.
Tube: NOS GE 5670×1
Maximum output: > 7.75V (>+20dBu)
SNR: 119dB(A) re. 2V, buffer,
0dB Gain
DNR: 31dB(A) re. +20dBu, buffer,
0dB Gain
THD & N: < 0.009% (re. 2V, buffer, 0dB
Gain, A- weighted)
Frequency Response: < 10Hz -to > 200kHz (-1dB)
20Hz – 20kHz (+/-0.003dB)
Input impedance: 1M ohm Direct Tube Buffer
100k ohm Pre-Amplifier
with Volume Control
Output stage output impedance: <1 ohm
Corrected output impedance: <150 ohm
Input voltage: AC 100-240V, 50/60Hz
Power consumption: <4W idle, 10W max
Dimensions: 175(l) x 67 (w) x 28 (h) mm
Weight: 278g (0.61lbs)

User Manual
“….the iTube2 will have to be pried out of my cold, dead hands before you will get it out of my system.” An iFi iTube2 review by Tyson on Audiocircle.

“…I absolutely freaking love the iTube2…you should try out the iTube2….the iTube2 will help out with the vast majority of systems…the closer you can use tube equipment to your source, the more impact it has….It connects with regular old analog RCA connectors. The iTube2 adds the tonal richness…. You keep the goodness of your existing equipment while fixing the core problem that modern recordings represent….Putting the iTube2 into your system gets you 95% of the improvement possible. Using the switches lets you dial in that last 5%….The iTube2 loses no resolution and still gives you the magic of tubes…It makes your system more true to real life.”

Thank you Tyson for your excellent review.

“Tube goodness just got better.” A review of the iTube2 by ostewart on Head-Fi.

“Pros: Flexibility, sound quality, form factor.”

“Firstly I would like to thank iFi for this sample to review…this unit has had over 50hrs of burn-in, no real differences were noted…They waste no space with the packaging, it is neat, looks good ad I really like it…Built quality is the same as the rest of the micro range, it is slim aluminium housed device, all precisely put together with excellent finish…This little device is packed full of great little features…For the most part, this is a valve buffer/pre-amp that adds a little tube magic in to the sound of your system….you have the Xbass switch, this is really good for smaller desktop speakers…the 3D Holographic has completely changed my desktop listening experience….The Xbass really helped fill out the low end without any added bloat. it is very precise and well controlled…iFi Audio has taken the original iTube, which was and still is an awesome device, and managed to squeeze even more out of it without making it bigger, the great thing about this is that it fits in to any system and you can let it have very little influence over the sound….it has make a big audible difference to my desktop setup…”

Thank you ostewart for your review.


“iFi Micro iTube2 – The magic of the tube for any audio system?” A review by Michael Holzinger (mh) on Sempre Audio.

“The iFi Audio, the new iFi Micro iTube2, which can take over the function of a tube output stage, a tube precursor, a tube driver and an impedance converter, and its direct predecessor, promises to be an unrivalled solution on the market, the iFi Tube has been significantly improved…To bring the magic of the tube into any audio system…Flexibility is the top priority for the new iFi Micro iTube2. This should bring ‘tube sound’ to any audio system, be it as a tube output stage, as a tube preamp, tune drivers and impedance converters. The compact housing, as well as the flexible adaptation of the parameters, should support this flexibility…The magic of a tube in any audio system, this is the task according to the manufacturer iFi Audio is the new iFi Micro iTube2….This is presented as a completely revised new generation, using new improved components and a newly developed circuit. The basis for this was the so-called ‘trickle-down’ technology…the new iFi Micro iTube2 will be able to function as a tube output stage, tube precursor, tube driver and as an impedance converter…The iFi Micro iTube2 defacto is unrivalled in the market, as there is simply no other solution that can be used so flexibly…”

Thank you Michael Holzinger for your review.

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iFi Micro iTube 2: A review by Darktores on Tellement Nomade

“we love the dynamic sound…The offer is enormous, the rolling tube is sometimes expensive but when you find the source or the amp that goes well, then it is really special….iFi Audio proposes original solutions…there is one for everyone. I took a lot of fun to set up my iFi set….I was really among the very first in the world to listen to this iTube2. It is a small device, a small buffer with big sound but still the exclusivity and the primeur is always fun….the iTube concept is primarily thought for open listening on loudspeakers…I was really charmed by this iTube2!…the iTube2 blows a much better level of ‘tube’ rendering…another product well built, easy to implement, affordable and performing that will do what it is designed to give…”
Thank you Darktores for your review.

Translated with Google.