Head-Fi.org › Forums › Equipment Forums › Portable Source Gear › Teclast T51
New Posts  All Forums:Forum Nav:

Teclast T51 - Page 86  

post #1276 of 1468

Here you can find a link to the lay-file, to register for download. ctrl + f - 1886.zip.

post #1277 of 1468

Nope. But i am determined to do this. Thanks a lot w357. I suppose you yourself have done this mod :D


Edited by Cryok95 - 1/29/12 at 5:16pm
post #1278 of 1468

I apologize for the Google translator, but my own English is too weak

 

Quote:
Originally Posted by Cryok95 View Post


I see, kk plan foiled lol.



Anyway forgive me for asking but i dont really understand this part. Could you care to explain?



after the publication of FAQ, I changed the connection method. Now all the contacts of the operational amplifier mounted on the motherboard again. signal paths on the board, leading the signal from the LPF should be cut. 1,2,4 and 5 contacts of the volume control removed from the motherboard and are only connected to the wire. it is possible to reduce noise and interference from the motherboard to the amplifier. Besides re-enabled feedback to filter the DAC.

 

at the moment, the amplification factor = 3. if you replace resistor 1K for a longer (up to 10K), then you can raise the gain up to 12. in such a player can easily play with headphones with impedance up to 600 ohms.

 

from today I think the project completed. No more changes, I do not want to make.

 

Today, my Ultimate mod unique in the world. I hope my achievements will help many enthusiasts and the number of good-sounding T51 will only increase.


Edited by Hardcorist - 1/31/12 at 12:44am
post #1279 of 1468
Quote:
Originally Posted by Hardcorist View Post


from today I think the project completed. No more changes, I do not want to make.

Today, my Ultimate mod unique in the world. I hope my achievements will help many enthusiasts and the number of good-sounding T51 will only increase.

respect. wish I could hear/buy one smily_headphones1.gif
post #1280 of 1468
Quote:
Originally Posted by Hardcorist View Post

I apologize for the Google translator, but my own English is too weak

 



after the publication of FAQ, I changed the connection method. Now all the contacts of the operational amplifier mounted on the motherboard again. signal paths on the board, leading the signal from the LPF should be cut. 1,2,4 and 5 contacts of the volume control removed from the motherboard and are only connected to the wire. it is possible to reduce noise and interference from the motherboard to the amplifier. Besides re-enabled feedback to filter the DAC.

 

at the moment, the amplification factor = 3. if you replace resistor 1K for a longer (up to 10K), then you can raise the gain up to 12. in such a player can easily play with headphones with impedance up to 600 ohms.

 

from today I think the project completed. No more changes, I do not want to make.

 

Today, my Ultimate mod unique in the world. I hope my achievements will help many enthusiasts and the number of good-sounding T51 will only increase.

Thanks a lot Hardcorist. Almost have all the info i need for a successful mod. However, one last question. How and where do i mod to cut the signal from the LPF as underlined above?

 

I'm not very technically competent :D


Edited by Cryok95 - 1/31/12 at 1:16am
post #1281 of 1468
post #1282 of 1468

Still have to solder wire directly from pins 1 and 2 of op-amp to pins 1 and 2 of volume control right? Guess i will have to use a sharp knife to cut the signal paths

post #1283 of 1468

rightly
 

Quote:
Originally Posted by Cryok95 View Post

Still have to solder wire directly from pins 1 and 2 of op-amp to pins 1 and 2 of volume control right? Guess i will have to use a sharp knife to cut the signal paths



op-amp contacts are soldered to the board to implement the feedback. then the signal goes through the wires to the volume control. conductors of the motherboard are not involved in this.


Edited by Hardcorist - 1/31/12 at 5:39am
post #1284 of 1468

I understand. Many thanks. Will let post some pics and impressions after the mod. Thanks again. Especially to hardcorist and w357!!!

post #1285 of 1468

dealt the finishing touch to give exclusivity

http://player.ru/showthread.php?t=67244&page=455&p=954753&viewfull=1#post954753

 

for some reason I can not attach a picture

post #1286 of 1468

Teclast T51 mod done..

 

Stock OPA2604 line-out opamp repalced with LM6172 opamp.

Stock defective invertors were replaced with good ones. 

 

The results are not dramatic, but their main goal has been achieved - no more distortion on every EQ preset. 

 

You can see the T51 RMAA result, before and after right here : rmaa.hostei.com

 

Some more comments on sound changes..

 

The signature became less analytical but still far away from analogical type of sound (hello Wolfson). The bright and digital treble presentation is still there but the bass gained more quantity (about 3~4 db more). The mids, I think, were also brought a little upfront (+ 1~2 db). Now, the signature is more pleasant then before, and I can use Normal EQ, with my VSonic GR07 (which are also analytic studio earphones). There are no other substantial quality improvements in the sound. The bass is still kind of mellow, soft, flabby (I suppose it's an internal amp issue), the mids sound great, trebles are still digital and synthetic. 

 

If you ask me is the mod worth the effort, the answer is definitely Yes. No more distortion, and far bigger amplification reserve + even better synergy with armature earphones (more bass quantity). 


Edited by AlexRoma - 2/5/12 at 12:44pm
post #1287 of 1468
Quote:
Originally Posted by AlexRoma View Post

Teclast T51 mod done..

 

Stock OPA2604 line-out opamp repalced with LM6170 opamp.

Stock defective invertors were replaced with good ones. 

 

The results are not dramatic, but their main goal has been achieved - no more distortion on every EQ preset. 

 

You can see the T51 RMAA result, before and after right here : rmaa.hostei.com

 

Some more comments on sound changes..

 

The signature became less analytical but still far away from analogical type of sound (hello Wolfson). The bright and digital treble presentation is still there but the bass gained more quantity (about 3~4 db more). The mids, I think, were also brought a little upfront (+ 1~2 db). Now, the signature is more pleasant then before, and I can use Normal EQ, with my VSonic GR07 (which are also analytic studio earphones). There are no other substantial quality improvements in the sound. The bass is still kind of mellow, soft, flabby (I suppose it's an internal amp issue), the mids sound great, trebles are still digital and synthetic. 

 

If you ask me is the mod worth the effort, the answer is definitely Yes. No more distortion, and far bigger amplification reserve + even better synergy with armature earphones (more bass quantity). 


great to hear/read that... since it is far less complicated then the "spaghetti master yoda mod" and the distortion is my highest concern i might try it. the rmaa also looks very promising. thx for the sharing Alex.

 

post #1288 of 1468
Good work!
post #1289 of 1468

I am sorry for a small mistake : Stock OPA2604 line-out opamp repalced with LM6172 opamp.

post #1290 of 1468

This thing is the biggest piece of CRAP!!!!! 2nd unit, stopped working after a month. CHEAP CHEAP! Save your $

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Portable Source Gear
This thread is locked  
Head-Fi.org › Forums › Equipment Forums › Portable Source Gear › Teclast T51