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FAQs

Bridge rectifiers power supplies (AC to DC)

Accessories Analogue DAC Digital General Lifestyle Power

Operation Power

Aurora DC iPurifier2 iPower iPowerX micro iCAN SE micro iPhono2 micro iTube2 nano iUSB3.0 Pro iCAN Pro iCAN Signature Pro iDSD Pro iDSD Signature Pro iESL ZEN Blue ZEN Blue V2 ZEN DAC

I have an iFi device that is powered by the iPower but might it be possible to use a different power supply that is not dependent on bridge rectifiers (AC…

Can I re-roll the tube?

Accessories

Operation

micro iTube2

The tube GE5670 can be replaced, yes, it is socketed. GE5670 is a premium of 6922 family so unless Bendix 6N3 or WE396A then not worth rolling. Since tubes are…

Can it drive external transformers volume controls (TVCs)?

Analogue

General

micro iTube2

Yes, absolutely.

How long for warming up does it take?

Analogue

Operation

micro iTube2

The iTube 2 warms up quickly (under one minute) and sounds best at around the 15-minute mark.

How long shall I burn-in this for?

Analogue

General

micro iTube2

To burn in the iTube 2 we suggest connecting it to a DAC run for 24/7 – this would see proper burn-in period.

Is DC present on the outputs?

Analogue

General

micro iTube2

iTube 2 is DC coupled. Meaning there is no coupling capacitor. It uses a DC servo to zero out any DC output on the output to a few millivolts (a…

Is it OK to leave it powered 24/7?

Analogue

Operation

micro iTube2

Yes. The GE5670 is NOS, ie military grade. It is run very conservatively so isn’t driven like a normal valve and we are running nominally around 30V/1mA: rated at 100,000…

Is it possible to use in a car?

Analogue

General

micro iTube2

Yes, you can use the iTube 2 in a car, it runs off 12v.

Sub-woofer – Can this be used with Y splitter?

Analogue

Operation

micro iTube2

I’m running the iTube 2 as a pre-amplifier but since there is only one set of outputs is there any problem attaching a Y-connector to the outputs so one leg…

Two-channel push-pull configuration out of just one GE5670 tube?

Analogue

Operation

micro iTube2

The actual circuit used is single-ended Class A. What each signature refers to is a harmonic envelope and relative levels of harmonics. These are achieved by adjusting the open-loop gain…

What are the input/output voltages in different modes?

Analogue

General

micro iTube2

Question: What is the maximum RCA input voltage that the iTube 2 can receive in default 0db buffer mode? And in 9db buffer mode? Answer: For undistorted output, the following…

What is the barrel size?

Accessories Analogue DAC Digital General Lifestyle Power

Operation

Aurora DC iPurifier2 iPower iPowerX micro iCAN SE micro iPhono2 micro iTube2 nano iUSB3.0 Pro iCAN Pro iCAN Signature Pro iDSD Pro iDSD Signature Pro iESL ZEN Blue ZEN Blue V2 ZEN DAC

5.5*2.1mm is the DC barrel size.

What is the maximum input voltage on the line in?

Analogue

Operation

micro iTube2

It will easily handle the standard 2v input.

What is the output impedance?

Analogue

Operation

micro iTube2

150 Ohm. Further question: Does it change when using variable volume control? Answer: No. For a bonus, the input impedance is also fixed, 1 MegaOhm in fixed gain mode and…

What’s the amperage consumption at 12v within a car?

Analogue

General

micro iTube2

iTube 2 should draw around 0.5A (approx.) @ 12V.

When should I use gain?

Analogue

General

micro iTube2

Where you actually want a pre-amplifier, naturally, meaning sources with lower output. Another option when using it as a pre-amplifier for a power amplifier but too much gain without turning…

Why is AC present on RCA if nothing is connected?

Analogue

Operation

micro iTube2

There is no ground/earth.

XBass frequency boost with gain added?

Analogue

Operation

micro iTube2

Question: Is it only and specifically 20Hz that is augmented or is it the bandwidth around 20Hz? In other words, is the Q high (narrow bandwidth) or low at 20Hz…