Aune T1 USB Tube DAC+ SS Amp Discussion Thread ***See first post for FAQ--Updated on 02/14/15***
Dec 13, 2018 at 10:49 AM Post #8,191 of 8,309
Yeah I think I'll do that.
But when I do, I might as well also pay him to upgrade some of the electronics like you suggested before.

Next highly recommended upgrade is capacitors, which is cheap and A LOT cheaper than hunting for rare expensive tubes.
Also upgrading headphone amp board opamp for ~10€ will bring noticeable upgrade for relatively small money.

Would be best if I knew the exact parts that would be needed for this. <3
 
Dec 13, 2018 at 10:56 AM Post #8,192 of 8,309
Yeah I think I'll do that.
But when I do, I might as well also pay him to upgrade some of the electronics like you suggested before.
Would be best if I knew the exact parts that would be needed for this. <3
Easier and least costly way?
Just replace stock capacitors (with exact same values ones) but quality ones:
Panasonic FR for primary power supply filtering, all others go for Panasonic FC.
You can take a look at my head-fi Aune T1 gallery and read descriptions of stock capacitors.
I used FR for primary PSU filtering and all others Elna SilmicII`s (which are lot more expensive but sound quite similar to FC)
 
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Dec 13, 2018 at 10:40 PM Post #8,193 of 8,309
That's actually exactly what happened when the issue started. I turn the DAC on each day and turn it off at night. So at first, I would only hear it for a few minutes. Later on it would take longer and longer.. That's originally why I suspected it was the tube, since it was Ok once the tube was warmed up. A few months later and it wouldn't go away anymore, the buzzing is there all the time.
So you're saying its the DAC board?

By the way, what about contacting the manufacturer.. I bet its out of warranty, but I've had some nice experiences with some big companies before. Although I got mine from Massdrop.
In my case it was the DAC board, and I think it might have been one of the components (like the capacitors as mentioned above). I sent it in for repairs and they replaced the board with a Aune T1 Mk2 board. It went away and works fine after the replacement.

When mine was faulty, I thought it was the tube too so I replaced it and it ended up damaging the tubes. My hunch is it messes with the bias voltage or something and the tube was running over the spec on the faulty. Heating up the tube by wrapping with thick cloth helped temporarily. I had to increase 1 gain on the ok channel to get it matched.

I didn't contact Aune but I contacted a local dealer (Stars Picker in Kuala Lumpur, Malaysia). They were nice enough to help with the parts acquisition and repairs for a modest fee and I think they're the best.
 
Dec 31, 2018 at 4:21 PM Post #8,197 of 8,309
Does not matter which hub You use with Aune T1 as it doesn`t draw any power from USB, only digital data signal.
 
Dec 31, 2018 at 4:42 PM Post #8,199 of 8,309
Use in compability mode (windows7) and try ASIO4ALL.
 
Jan 6, 2019 at 12:35 PM Post #8,200 of 8,309
Well, I've had my T1 (MK1) for 5 years now but it looks like it no longer is recognized by my PC over USB or my phone via OTG. I get a "Device Descriptor Request Failed" error. Looks like the T1 USB board has crapped out.

Does anyone have any DIY repair advice for me or first-hand experience with paying for repair through Aune?

Edit: Yes, I've tried different USB cables and different USB ports.

Aune T1.jpg
 
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Jan 6, 2019 at 5:49 PM Post #8,201 of 8,309
Did You try unistalling of drivers and clearing registry and installing new one? To me seem like it could be issue of broken windows library/registry too. No idea though.
Try with other PC to be sure.
 
Jan 6, 2019 at 6:32 PM Post #8,202 of 8,309
Yeah, already tried on different PC. Do they sell the USB PCB part? Maybe I could do a full cap upgrade while I'm in there. Otherwise, I may have a bunch of T1 tubes to sell.
 
Jan 7, 2019 at 3:08 AM Post #8,203 of 8,309
I don`t see there a separate USB board. USB connects straight to main PCB. So, best thing to do, is to get it to electronics specialist and let him test for faulty components.
My guess is USB receiver chip related fault.
 
Jan 8, 2019 at 9:18 AM Post #8,204 of 8,309
For information - OPA1612 works nicely instead NE5532 @ headphone amp board. OOTB, I like it more than AD8599ARZ which was little too much "detail thrown in face" but also very good.
Will leave it playing for week and report back vs. NE5532.
 

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