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Aune T1 USB Tube DAC+Amp Discussion Thread ***See first post for FAQ*** - Page 105

post #1561 of 5683

yep it's a eh 6922.  I just tried moving the power brick to the other side of the room away from everything, no change.  I also noticed that if I increase the gain to 10, the hum is louder.  I'll just wait til my voshkod tubes arrive and see if they have the same problem.  I have a feeling it's not the tube, because when bypassing the tube dac and using line in, it still has it.  I can live with it i guess

Maybe I am a "goldenears" after all and every t1 has it but only I can hear it :)

post #1562 of 5683

My T1 doesn`t have any hum for sure! Only with certain tubes which have thin glass tend to hum only very very littlebit when the volume knob is turned to MAX and nothing is playing. And I didn`t mean power brick about that electricity, I meant placing Aune T1 for example too close to monitor. Also you should check your wall sockets grounding. Another chance is that your PC USB ports have somekind of ground issue. Try to cut off +5VSB pin at the end of PC side of the USB cable, Aune T1 doesn`t draw any power from USB. It is one of the first things I did with my new foil shielded shorter cable (not that I had any problems with stock cable). Also, it might be that you have faulty power-brick.

If problem stays after all those things, I would send that unit back to seller and ask for replacement. It`s not how Aune T1 should sound & work.


Edited by CoiL - 4/16/13 at 12:04pm
post #1563 of 5683

Try bypassing the tube using the aux in with the tube pulled out

post #1564 of 5683

buestad, read carefully, he did it already!

post #1565 of 5683

Using the aux in with the tube pulled out fixes it.. but as soon as the tube goes back in, even while still using aux instead of usb, the hum comes back.  I don't think it's my pc usb ports because I tried running the usb cable to my monitor's usb port hub and hum was still there.  I have moved the t1 away from my monitor and tried a power socket in a different area of the room..  I'm going to try it with my other computer, a laptop far away from any other electronics.

Coil that's interesting that you say you sometimes get hum at max volume.. I've noticed the volume knob doesn't affect the hum at all

edit: same hum with the laptop in the bathroom.  The shipping cost to send it back is probably about the same as I paid for the 2 shady T1's on ebay.. so I'm gonna wait and see if a new tube fixes it.. hopefully shipping from the ukraine is fast, that's where my voshkod are coming from


Edited by uncola - 4/16/13 at 2:35pm
post #1566 of 5683
Quote:
Originally Posted by uncola View Post

Coil that's interesting that you say you sometimes get hum at max volume.. I've noticed the volume knob doesn't affect the hum at all

Hmmm, then it must be something wrong inside the aune or tube is bad. Can`t think of anything else because it doesn`t seem to be tube microphonics due to thin glass like in my case with some tubes. I`m guessing it`s bad tube (shortage, leak etc.).


Edited by CoiL - 4/16/13 at 2:36pm
post #1567 of 5683
Quote:
Originally Posted by CoiL View Post

I suspect that this grey plate large O-ring getter version might be relabeled Mullard PCC189 but no certain information on that. Anyway, seems to be great tube also. Will make head-to-head comparing with my Ultron.

I don't see any Mullard markings on it or anything from the Phillips plants, no Siemens markings either. I have a Mullard 6dj8 and it doesn't sound like it at all. My Ultron PCC88 should arrive tomorrow. I ordered a Tungsgram E88CC, maybe it is something like that, but it has been almost a month and still has not arrived from Bulgaria, according to Bulgarian post office it is "Insert item into bag (Otb) and Send item abroad." :)


Edited by nykobing - 4/16/13 at 7:05pm
post #1568 of 5683
Quote:
Originally Posted by audiofrog View Post

I just put in my order on ebay

 

http://www.ebay.com/itm/Aune-T1-DAC-Hi-Fi-Pre-amp-Audio-Amp-24Bit-96KHz-6N11-Tube-Headphone-Amplifier-/130889822865?pt=Home_Automation_Kits&hash=item1e79a43291

 

$59.70 including shipping!  Lets hope this order goes well!  

price dropped to $9.80, assuming these are fake...

post #1569 of 5683
Quote:
Originally Posted by kobetastic View Post

price dropped to $9.80, assuming these are fake...


It's always been $9.80 there.

post #1570 of 5683

Oh oops, assumed it was $59.70. 

post #1571 of 5683

Like other member said the seller play around with the shipping cost to get most of his profit, FWIW T1 sells for about $100 on taobao, you could probably get it even cheaper offline in china but probably not $60 cheap, not including international shipping. So at best those T1 on ebay are refurbished unit and at worst, different el cheapo tube dac model.

 

That said I couldn't resist the temptation. tongue.gif

post #1572 of 5683

heh Aune got back to me, $2 for the fences but $20 for ems shipping.. I think I'll just use the tube without protection

post #1573 of 5683

Originally Posted by CoiL View Post

buestad, read carefully, he did it already!

Wops, read it to fast :)

 

 


Originally Posted by uncola View Post

...hopefully shipping from the ukraine is fast, that's where my voshkod are coming from

 

I just got a pair of 6N23P voshkod from Ukraine. It took exacly one week (to Norway)

 

 

post #1574 of 5683
Quote:
Originally Posted by laon View Post

Like other member said the seller play around with the shipping cost to get most of his profit, FWIW T1 sells for about $100 on taobao, you could probably get it even cheaper offline in china but probably not $60 cheap, not including international shipping. So at best those T1 on ebay are refurbished unit and at worst, different el cheapo tube dac model.

 

That said I couldn't resist the temptation. tongue.gif

The cheapest I saw was 660 Yen, which is about $106 US. They've got to add in shipping, and to the US $50 is about right, maybe a little less. Seems about the cheapest legitimate you can get is in the $135 to $150 range. I'll be interested in see what the folks get for $60.  To be honest, I paid $160 for mine and don't feel one bit bad about it.

post #1575 of 5683
Quote:
Originally Posted by nykobing View Post

I don't see any Mullard markings on it or anything from the Phillips plants, no Siemens markings either. I have a Mullard 6dj8 and it doesn't sound like it at all. My Ultron PCC88 should arrive tomorrow. I ordered a Tungsgram E88CC, maybe it is something like that, but it has been almost a month and still has not arrived from Bulgaria, according to Bulgarian post office it is "Insert item into bag (Otb) and Send item abroad." :)

There probably are no markings because it`s relabeled. And I was talking about PCC189 not 6DJ8, of course they are different sounding tubes.

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