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Aune T1 USB Tube DAC+Amp Discussion Thread ***See first post for FAQ*** - Page 371

post #5551 of 5953
Yeah, I agree... Mine has always ran hot as well. I don't think 40C would be a problem, but over 50C is probably a bit high... (104f and 122f respectively). The reviews I had read mentioned that the T1 runs warm, and I've just accepted that to be normal because of the compact size.

Also, I don't think it's a good idea to touch the tube while it's warm, and/or when it's cold. I heard oil on our hands can affect the glass on the tube, once it heats up. (I am not a tube expert, just what I've read).
post #5552 of 5953
Hmm, mine doesn't run that hot. I can rest my palm on the unit for hours. I'll get tired before I get hurt. the tube, I can hold for 5 seconds before it gets too hot.
post #5553 of 5953

Only found one other person who experienced the same issue, the only difference being that my listening session lasts longer before the problem appears.

 

Quote:
 Unfortunately, i am having terribly bad luck at buying tubes or the ones I have selected are not fully compatible.

Philips Miniwatt ECC85 by Mullard 1957 NOS
Vintage Fisher Mullard 6AQ8 ECC85
NOS NIB GE (made by MULLARD) 6AQ8 ECC85 Vacuum Tube Tv-7

But all 3 are giving me the same issue. They seemingly work great for about 5 or so minutes and then after that everything becomes muddy/distorted.

 

I sent him a PM to see if he could tell me what happened in his case since that msg was posted in January. We'll see if he replies...

 

In the meantime, wondering if the people who have units that are cool to the touch could post which tube they are using, please? :)

post #5554 of 5953

Just got a reply back.

 

Quote:
 What this turned out to be was the tubes I was purchasing were NOS tubes. These tubes, while old (1960s, etc), were new and needed to be burnt in. After powering on the Aune with one of these "new" tubes and letting it burn in the tube for period of 48 hours everything would sound great. I hope this helps!

 

What's puzzling is that my tube's been working great for 10 months and only now is this issue popping up.

 

I've ordered a new tube which I'll get next week. Hopefully, the issue is as simple as replacing the tube!

post #5555 of 5953
FWIW, The tubes that I use are in my profile.
post #5556 of 5953

Maybe the fact that you're using a tube that dissipates 2.7 watts whereas mine is 3 watts contributes to the issues that I'm having? If it's heat-related, it could factor in.

 

Anyway, I doubt that I'll get any idea on that until the next weekend when I get the new tube.

 

In the meantime, if anybody else can list their tubes in their cold-to-the-touch T1 units, that'd be appreciated. :)

post #5557 of 5953

Haven't heard back from Audiophonics yet regarding my dead T1 MKII (probably due to the weekend), but will keep you guys posted.

post #5558 of 5953

I use a 1969 Holland Amperex Orange Globe 6DJ8 and the my T1 feels slightly warm while the tube is too hot to touch for more than a second or two. I get a similar effect from the EH6922, but I rarely use that tube.

post #5559 of 5953
Right now I'm using a '62 Amperex Bugle Boy 6DJ8. The top isn't too hot, but I can only touch the tube near the filaments for about 2 seconds before I have to pull away.
post #5560 of 5953

Guys, stop touching the tubes. They can get permanently damaged that way..

post #5561 of 5953
Really??? :O Why is that? Sorry, I'm noob about tubes....

Quote:
Originally Posted by xkonfuzed View Post

Guys, stop touching the tubes. They can get permanently damaged that way..


 




And guys, are you seriously telling me you guys touch the glowing tube? Is that even safe? You guys are brave! LOL
I myself wait for several minutes after powering off before touching the tube biggrin.gif
post #5562 of 5953
Quote:
Originally Posted by jipan View Post

Really??? :O Why is that? Sorry, I'm noob about tubes....
 
Quote:
Originally Posted by xkonfuzed View Post
 

Guys, stop touching the tubes. They can get permanently damaged that way..

 




And guys, are you seriously telling me you guys touch the glowing tube? Is that even safe? You guys are brave! LOL
I myself wait for several minutes after powering off before touching the tube biggrin.gif

Quoted from UpScaleAudio: 

 

"Repeatedly tapping on a tube's glass can cause a perfectly good tube to become too microphonic for use.

ALL tubes are microphonic to a greater or lesser degree. Whether or not that microphonics is audible will depend more on the tube's function in the product, rather than the microphony of the tube itself. In some positions, you will never hear anything, even with the worst tube. In other positions you will hear something even with the best tubes. At that point you make a judgement call: does this level of microphony interfere with my listening enjoyment?

Tubes are supposed to make noise when tap you tap on them! If a tube is truly microphonic, and in a position where it is critical, you will know it. It will feedback as you play music and be so objectionable you'll turn it off."

Also, generally speaking, tubes logos are made of ink that will fall off easily. So when you keep touching it (especially when its hot), the logo will go away.

post #5563 of 5953
Who said they were tapping tubes?
post #5564 of 5953
Quote:
Originally Posted by xkonfuzed View Post
 

Quoted from UpScaleAudio: 

 

"Repeatedly tapping on a tube's glass can cause a perfectly good tube to become too microphonic for use.

ALL tubes are microphonic to a greater or lesser degree. Whether or not that microphonics is audible will depend more on the tube's function in the product, rather than the microphony of the tube itself. In some positions, you will never hear anything, even with the worst tube. In other positions you will hear something even with the best tubes. At that point you make a judgement call: does this level of microphony interfere with my listening enjoyment?

Tubes are supposed to make noise when tap you tap on them! If a tube is truly microphonic, and in a position where it is critical, you will know it. It will feedback as you play music and be so objectionable you'll turn it off."

Also, generally speaking, tubes logos are made of ink that will fall off easily. So when you keep touching it (especially when its hot), the logo will go away.

 

Sorry, but that's pretty much all balognea.

 

I've played guitar for many many years and have owned many tube amps. No tech, roadie, or guitar player wears gloves when changing tubes. It doesn't do anything if you touch the tube either.

 

That theory comes from electricians who said you shouldn't touch a halogen lightbulb with your bare fingers. Otherwise, you'll leave oils that will burn that part of the bulb quicker which will weaken the light and change its structure. Handling tubes with bare fingers is perfectly fine.

 

As for microphonics, gently tapping a tube with a pencil is an age-old way of testing this. Though every tube is subject to microphonics, great tubes will test in a way that microphonics are beyond human hearing, which means that they're essentially micrphonics-free... but they can develop microphonic qualities over time.

 

Nevertheless, I wasn't complaining about the tube being microphonic but rather that the sound becomes distorted after a few minutes. When I test it with another tube, I'll see if the problem is eliminated or not.

post #5565 of 5953

I ended up pulling my primary power caps (Nichicon Fine Golds) and putting in Panasonic FWs.  Now my bass is finally back, but those Nichicons have a clearer top end.

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