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iFi products Discussion Thread iTUBE will be out soon!! - Page 17

post #241 of 295

nice review, but if I may ask, what's so bad about no on/off switch? to me it's better in fact, since I have one less switch to flick when I'm powering on my desktop setup


Edited by Ophiel - 1/23/14 at 7:10am
post #242 of 295

Some people prefer having an on/off switch, I don't find it a problem.

post #243 of 295

Hi there.

 

Just to clarify - having a on/off switch to us, only serves a purpose if the unit can go into Standby. Otherwise, just switch off at the mains socket or unplug.

 

Following on from this, here in Europe, the EU put into place the 'Standby Law' whereby from 1st Jan 2013, ALL electronic components when entering standby, must consume <0.5W. (This came only after EU regulations in 2010 put into place Standby at 1W! so you can see they are becoming more and more severe).

 

As you can appreciate, to have a Standby switch which consumes <0.5W serves no purpose and the fact is that to have a EU-abiding electronic component for now and the future, we decided to go down this route.

 

iFi is owned by Abbingdon Music Research and all their US$5k and higher components all adhere to the EU regulations and so must iFi. We just don't cut corners.

 

This stance ensures that you, the customer will always continue to have an EU-abiding electronic component which protects your long-term investment in this iFi product.

 

Because iFi drills down to the details, rest assured that our audio components conform to ALL the most stringent regulations as we stay ahead of the strictest of strict regulations. Yes, EU is nuts this way.

 

Hope this clarifies why we decided to go this way.

 

You, the consumer may not be aware of all the rules and regulations as it is a minefield but at least you can rest safely that iFi does and each and every iFi component conforms to the most stringent of regulations.

 

This explains why despite our developing 3D Holographic and XBass etc....we avoided the on/off switch. It just means your product conforms to the EU regulations for many years, come what may.

 

thank you!

post #244 of 295

Thanks for the clarification, and i doubt leaving it switched on will shorten the life of the amp, and the iTube has a switch because it is known that tubes don't last forever, but the iCan i can not see breaking just because it gets left on longer than some other products with the equivalent on/off switch.

post #245 of 295

Properly assembled iRack this time, with my recabled German Maestro GMP 400

 

 

 

post #246 of 295
Quote:
Originally Posted by ostewart View Post
 

Properly assembled iRack this time, with my recabled German Maestro GMP 400

 

Interesting.  I've never heard of German Maestro before but I see Amazon has them.  How good are they?

post #247 of 295

They are excellent, very under-rated here on head-fi, but everyone that has them, or has tried them love them. They need good amplification.

 

Great pairing with the iFi gear, iTube give them a smoother lusher sound, XBass gives them body and 3D on full gives you a very real out of head sound, I seriously thought the sound was playing from out of the laptop speakers earlier, rather than the headphones.

 

My GMP 400 review will be posted soon, they do lack a tiny bit of body, but the amp pairing will let you tailor it to your tastes, they have excellent detail, speed and articulation, with great soundstage.

 

Of course, designed as studio monitors they have quite a flat sound, but with the iCan's bass boost they are superb. The headphone cup suspension mechanism also makes them super comfy. 

 

Sat here listening to Leftfield - Leftism (awesome album) and very happy with the bass response yet with such clear highs and mid.


Edited by ostewart - 1/23/14 at 1:26pm
post #248 of 295
Quote:
Originally Posted by ostewart View Post
 

They are excellent, very under-rated here on head-fi, but everyone that has them, or has tried them love them. They need good amplification.

 

Great pairing with the iFi gear, iTube give them a smoother lusher sound, XBass gives them body and 3D on full gives you a very real out of head sound, I seriously thought the sound was playing from out of the laptop speakers earlier, rather than the headphones.

 

My GMP 400 review will be posted soon, they do lack a tiny bit of body, but the amp pairing will let you tailor it to your tastes, they have excellent detail, speed and articulation, with great soundstage.

 

Of course, designed as studio monitors they have quite a flat sound, but with the iCan's bass boost they are superb. The headphone cup suspension mechanism also makes them super comfy. 

 

Sat here listening to Leftfield - Leftism (awesome album) and very happy with the bass response yet with such clear highs and mid.

 

Great, thanks for the info.  Are there other brands/models they would be comparable to like Beyerdynamic DT-880 for example?

post #249 of 295

The GMP 400 would be comparable, apart from that not that I can think of. Only the SoundMAGIC HP200

post #250 of 295

well, the idsd has arrived, drivers loaded, listened very briefly, its charging now

anyone have any experience using the idsd with jriver ?? i was thinking it would do dsd over pcm( DoP ) do you just change in the bitstreaming setting ?

post #251 of 295
Thread Starter 

The German Maestro GMP 400 and 450, if classical is your thing. 

post #252 of 295

The GMP 400 works well with lots of genres

post #253 of 295
Quote:
Originally Posted by ostewart View Post
 

Thanks for the clarification, and i doubt leaving it switched on will shorten the life of the amp, and the iTube has a switch because it is known that tubes don't last forever, but the iCan i can not see breaking just because it gets left on longer than some other products with the equivalent on/off switch.

 

Hi,

 

The iTUBE has a GE5670. This is an original NOS military valve. Being of the correct military standard, it should last ~100,000 hours. If one listens for 8 hours per day...so 100,000 hours divided by 8 hours = 12,500 days. This divided by 365 days equates to 34 years.

 

The reason why valves fail prematurely is two-fold:

 

1. Thrashed at Anode Dissipation: take the 300B which is rated at max 40W. The WE Datasheet specified 10,000 Hours lifespan if the tube is operated at 18W anode dissipation (18 divided by 40 = 45% of max dissipation).

 

Many tube designs run higher, much higher. Say a 300B amplifier runs at 70-90% of max dissipation. This is like thrashing a car engine at 7,000-9,000 revs when the tacho reads up to 10,000 revs. As you can guess, in both instances, the valve and car engine are unlikely to last very long.

 

If run at 100% of max dissipation, one gets only 2,000 hours or ~1 year.

 

(As an aside, AMR once came across a pair of Ex-BBC Quad II Amplifiers, which had been used by the BBC in studio service for over a decade and then by the owner daily for many more years. The capacitors where shot, the resistors bad, but all tubes, even the KT-66 tested "Good". The tube set was the original one the Amp came with!)

 

 

2. Over-voltage: Philips many years ago published a technical paper which highlighted that even a 5% over-voltage, over the long-term (say a few years) halves valve life. So if you have a 6.3v valve and it is run at 6.9v (very realistic because of mains fluctuations) then the valve will fail prematurely.

 

All AMR/iFi gear the heater is slightly low (6V vs 6.3V) giving a significantly increased lifespan. Coupled with running at currents, voltages and anode dissipation much below limits means we get a very long life.

 

So please do not 'blame' good tubes for their short life span. Valves get such a bad rap when it is usually not their fault. (bty, dont blame the engine either).

 

Now that you have an appreciation of these two fundamental factors, we can say yes, the iTUBE is very conservatively run and should last for many years to come.

 

 

 

In terms of life-span, heat is the main killer and even the fairly warm running iCan does not reach temp's that caused increased aging, so aging of components will be more or less shelf-life, as no part is run hard. Only the iTube runs quite hot and hence is fitted with a power switch, to allow the user to choose prolonging the unit's lifespan (which is conveniently incorporated into the vol pot).

 

Bty, the GE5670 is socketed so one can swap out if something does goes wrong because there are now quite a few iTubes out there and we have a quite a few of these puppies baked and tested...if you are a tubeoholic, watch this space.  ;-)

post #254 of 295
Quote:
Originally Posted by jaywillin View Post
 

well, the idsd has arrived, drivers loaded, listened very briefly, its charging now

anyone have any experience using the idsd with jriver ?? i was thinking it would do dsd over pcm( DoP ) do you just change in the bitstreaming setting ?

 

Hi, checkout the iDSD thread. We have uploaded JRMC instructions there.

 

regards

post #255 of 295
Wow that's a lot of info about tubes
Great stuff

I didn't expect the ITube to die any time soon. That's a long lasting tube.

I would like to see a mullard tube in the iTube.
Edited by ostewart - 1/24/14 at 3:51am
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Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › iFi products Discussion Thread iTUBE will be out soon!!