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Aune T1 USB Tube DAC+Amp Discussion Thread ***See first post for FAQ*** - Page 215

post #3211 of 5112

I just brought the beyer dt 800 Prem 600 OHM. When i'm using the aune t1 to listen to music there alot of distortion. Is there a way to fix it or something? its bothering me >_<

post #3212 of 5112
Quote:
Originally Posted by Acknown3 View Post
 
Quote:
Originally Posted by CoiL View Post

Go for Amperex OG 6Dj8/ECC88 (GAC coded is best for prog rock imo). Other options would be Ultron SQ PCC189/7ES8 (gold label Bharat India made, if you can find it, basically same sounding as OG but I find it tinybit better) or Siemens PCC189 (Mullard made) is also good for progressive metal/rock/djent. Also, there`s Siemens PCC88/7DJ8 (warmer tube than OG and for classical maybe too warm, littlebit smaller soundstage too if I remember correctly). Use search in this thread for more information and impressions, these are my main recommendations for progressive rock/metal/djent.
Alright, I'll do more research on those. Since the search function also yielded a lot of complaints about the Aune amp, is there another one you would recommend at or slightly above $100? I was considering a little dot, but I don't want to spend money on tubes for that too. From what I understand the O2 is only slightly better than the Magni, and since they go for $120 on eBay they would be the best option.

Depends. First thing I`m recommending is to try Aune T1 amp and IF you feel anything wrong/short, then start looking for another amp. I personally don`t find anything wrong with Aune T1 amp coupled with my modified Superlux HD-681 (mkII)... I`m just curious to try another amp and experiment ;P If you want to go cheap and good then maybe PA2V2 is better option? Don`t know but someone in here liked it very much with Aune T1 as DAC.

 

Quote:
Originally Posted by Pocky View Post
 

I just brought the beyer dt 800 Prem 600 OHM. When i'm using the aune t1 to listen to music there alot of distortion. Is there a way to fix it or something? its bothering me >_<

Have you tired flipping gain switches under Aune T1? Sounds like you don`t use enough gain for your cans. If gain switches doesn`t affect that sound, then try another jack adapter (if you are using one) or last option would be faulty tube.

 

Quote:
Originally Posted by Salvatore View Post
 

Aune T1 gain settings:

 

 

Edited by CoiL - 11/7/13 at 1:35pm
post #3213 of 5112
Quote:
Originally Posted by CoiL View Post
 

CmoyBB v2.03: 
 

  • Alps RK097 Volume Control and On/Off Switch
  • Bass Boost Toggle Switch
  • DC Auxiliary Power Jack
  • Automatic On/Off (senses headphone cord)
  • Texas Instruments OPA2227 Opamp in Gold-Plated DIP Socket
  • Texas Instruments TLE2426 Precision Virtual Ground (2x optional)
  • Decoupling Capacitors on All IC Supply Pins
  • Custom 2-Layer PCB: Compact Layout with Ground Plane 

 

Aune T1:

  • headamp board transistors are B649 / D669
  • Headamp board opamps are NE5532
  • PCM1793 DAC + TE7022
  • DAC opamp OPA2134

 

 

I know I have asked it already but has anyone tried or willing to try rolling opamps or maybe even h-amp transistors (for example like in case of indeed/bravo tube amp)? :P Sorry if I told something wrong, I`m total noob about opamps ;D

 

Coil,

 

I'm talking about just the amplifier circuit itself, not the DAC portion or the buffer portion. The CMOY circuit can be built many different ways, it does not necessarily require an OPA2227 or TLE2426.   The CmoyBB implementation is just one of many.  I've built at least 3-4 different implementations myself over the years. 

 

To put it in more generic terms, the amplifier section itself is a pretty simple op-amp based headamp.

post #3214 of 5112

Thanks for clarification ;) Since you seem to have lot more knowledge in opamps, what can you say about rolling those opamps?

post #3215 of 5112

CoiL,

 

Rolling the op-amp may be an option for the advenurous, but being that it's SMT, it would require careful de-soldering / re-soldering and would run the risk of lifting trace(s) on the board.

 

 If you'd like to get into DIY and roll opamps it might make more to sense to build an external amplifier with a socketed DIP opamp(s), which would make rolling a lot simpler.

post #3216 of 5112

Okay, lets say that I have a guy who can do it easily and will implement a DIP socket inside Aune T1 - which opamps are compatible and what do you recommend to try? Is it just change-opamp-operation or do some other components require changing/modification?

post #3217 of 5112

CoiL,

 

Some that come to mind that _may_ work.

 

opa2604
opa2134
opa2641
LM4562
opa227/opa228

 

 

Make sure the supply voltage that the T1 is providing falls within the spec of the op amp as well.  Also check the current draw, as if the power supply can't supply what's needed for the replacement opamp, it could cause other failures.   Some opamps can be prone to oscillation and are harder to just drop in without other mods.

 

If you're not familiar with electronics, I would suggest doing plenty of reading/learning before just dropping anything in.

 

  -Mike

post #3218 of 5112
Quote:
Originally Posted by mhamel View Post

From what I can tell after taking apart the T1, the amp section is basically a CMOY with switchable gain.   For 600 ohm cans, it may make more sense to use the T1 as a DAC/buffer to feed an external amp.   I've been playing around with it feeding my Lyr and it is a significant improvement over the internal amp.
Yeah, I do that myself. I ran it with an o2 at first, now I use a darkvoice 336.
post #3219 of 5112

Yeah im using 16 Gain ATM. I'm also using USB.

post #3220 of 5112

Does the gain change anything besides volume?  Using Sony AKG K550 which are 32 ohms.

post #3221 of 5112
Quote:
Originally Posted by Pocky View Post
 

Yeah im using 16 Gain ATM. I'm also using USB.

And distortion still present? Then try another tube, if that doesn`t change anything, then your Aune T1 is probably faulty but when it`s tube you are "lucky", easy to change. Using 6922EH tube atm? There are many cases with 6922EH being faulty tube or "die" fast.

post #3222 of 5112
Quote:
Originally Posted by CoiL View Post
 

And distortion still present? Then try another tube, if that doesn`t change anything, then your Aune T1 is probably faulty but when it`s tube you are "lucky", easy to change. Using 6922EH tube atm? There are many cases with 6922EH being faulty tube or "die" fast.

Yeah. Any tubes u recommend or know where to buy?

post #3223 of 5112

eBay? upscaleaudio? Tubemonger? read the thread? Google? Can`t give recommendations if I don`t know what music you prefer, what nuances are important for you in the sound, what cans you use (maybe you use multiple cans) etc. And I didn`t get it - are you using jack adapter or not? Asking because many users here have experienced problems due to bad 3.5mm>6.3mm jack adapter.


Edited by CoiL - 11/8/13 at 1:47pm
post #3224 of 5112

Ebay ;D

post #3225 of 5112

I thought I'd ask the question before rushing out and grabbing one.. I can't tell if it's an awesome idea or not. 

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