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Aune T1 USB Tube DAC+Amp Discussion Thread ***See first post for FAQ*** - Page 361

post #5401 of 5838

can some one explain to me how am i the only one in this thread with defective aunes???

post #5402 of 5838
Quote:
Originally Posted by guy3134 View Post
 

can some one explain to me how am i the only one in this thread with defective aunes???

Same reason why my laptop, wireless mouse and phone all broke within a couple weeks of each other.

 

Hope you manage to get a working T1 eventually :<

post #5403 of 5838
Maybe it's a power issue? How exactly are they defective?
post #5404 of 5838
Quote:
Originally Posted by guy3134 View Post
 

can some one explain to me how am i the only one in this thread with defective aunes???

Mine is defective too. The left channel is significantly louder than the right. 

post #5405 of 5838

Check your gain settings (the jumper switches on the bottom), mine somehow gets off and it's always the gain settings.

post #5406 of 5838

Mine had balance problems and static on the left channel too. I pulled the tube and switched all the switches a few times and have been using it a lot for the last couple of weeks and so far (touch wood), neither problem has resurfaced.

post #5407 of 5838
Quote:
Originally Posted by NCSUZoSo View Post
 

Check your gain settings (the jumper switches on the bottom), mine somehow gets off and it's always the gain settings.

Nope not the gain settings. The problem is in the DAC portion of the unit. As an amp works fine, but if I USB in > RCA out, it has channel imbalance.

post #5408 of 5838

Did the recap last night and have left it running all night.

 

I did try listening and it was totally distorted.

 

I've had to turn the volume down to about 10% on Foobar and crank up my separate headphone amp from 1/4 to 3/4 and it sounds fine.

 

It is however useless without the separate amp as even with the volume full up I can't hear much coming through the headphones.

 

Moral of the story...Stick with the tried capacitors in the forum and don't try to upgrade them.

 

That being said, I have listened a bit to it this morning (it's constantly burning in at the moment) and it sounds...different. totally different in fact.

 

The sound stage is very very wide and out of the head and in front. Everything sounds a bit more separated, spaced out and slightly further away but clearer too.

 

The slight sibilance on a couple of Daina Krall tracks has vanished and the frequency range sounds flatter and extends further into the high ranges.

 

Caps are

Nicholson nka-240 3300uf 25v x2

black gate std 47uf 50v x2

elina cerafine 470uf 25v x4

post #5409 of 5838

not nicholsons  nichicon

post #5410 of 5838

my first aune had distortion that was overwhelming.

 

the second has "ticks" when i switch song on foobar, and moving through the seekbar.

post #5411 of 5838
Quote:
Originally Posted by audioisemotion View Post
 

Did the recap last night and have left it running all night.

 

I did try listening and it was totally distorted.

 

I've had to turn the volume down to about 10% on Foobar and crank up my separate headphone amp from 1/4 to 3/4 and it sounds fine.

 

It is however useless without the separate amp as even with the volume full up I can't hear much coming through the headphones.

 

Caps are

Nicholson nka-240 3300uf 25v x2

black gate std 47uf 50v x2

elina cerafine 470uf 25v x4

Hmm, distortion... that sucks. Did you get a chance to test out the caps before you put them in? I've heard sometimes the polarity marking on the case can be pointing to the wrong lead. (Don't know if a backwards cap would just explode, or maybe just cause distortion...)

 

I've heard good things about the Cerafine's, and also the Black Gates... sounds like if you could get the distortion to go away, you'd be happy with the upgrade? Keep us posted on how they burn in, if you decide to keep them. Thanks!

post #5412 of 5838

I don't have a meter capable of testing capacitance, so no I didn't test them.

 

I might put the original power caps back, dropping the nichicon's. Test it then move forward through the chain replacing the originals and testing the effect as I go.

 

I'll need to buy a meter which can do caps.

post #5413 of 5838

You can also very easily test caps with an ohmmeter (I'm an electrician and usually just use my ohmmeter).

 

It won't verify that their capacitance value matches specification, but it will verify that the capacitor isn't open or shorted, and also that the polarity marking is correct.

 

Put your meter on resistance (ohms), and then meter leads to the capacitor leads... one way the capacitor will charge, so very low resistance (starts around 0 ohms) and climbs up to a high value of resistance (probably Megaohms, once the capacitor is charged - the meter may also show OL which means overload, which means open, or very high resistance).

 

Put your meter back to volts DC, and then let the capacitor discharge through your meter leads... it will show 9 volts, or whatever value the capacitor charged to, and then go down to zero volts, as the capacitor discharges into your voltmeter.

 

This is a very easy way to verify that the caps are good, without having to buy a meter with a capacitance check on it.

 

edit: Of course, capacitors store energy and could have dangerous voltage present. You can discharge capacitors through a voltmeter and should be aware of the danger. I've also read a bunch of sites suggesting to short capacitors out to discharge them which is very stupid and can cause the capacitors to rupture. The caps in the Aune don't hold dangerous charges, just put in the edit for others as well so they're aware.


Edited by mikoss - 6/15/14 at 4:05pm
post #5414 of 5838
Meh, I just remembered about wanting to change the caps in my Aune T1 but that was after I placed an order at Mouser for more DIY audio jacks. :\
post #5415 of 5838

thanks for that, you learn new things all the time.

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