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New hybrid amp by Little Dot, I+ - Page 50

post #736 of 775
Quote:
Originally Posted by john57 View Post
 

Sounds more like an adapter problem. Make sure the headphone and the adapter are fully plugged in with each other. The headphone  jack on the Little Dot 1+ is usually has a  metal jacket.

 

Thanks John.  I ended up swapping it out with a second adapter I had kicking around.  I spent an hour listening, and everything was fine.  I noticed some black smudge like marks on the first adapter, so I assume it needs to be cleaned.

 

Does anyone clean the port on the little dot?

post #737 of 775

Hi,

I've got my new DOT I+ a week ago and since then I get a constant noise.
I've tried to change headphones (AKG K550, JVC S400 and some IEMs) and adapters but always getting the noise.
I've tried to change position (not near any other electronic device) but no help.

This is my fist tube amp and it might even be normal...but it's quite annoying.

Should I send it back or is this something I can easily adjust?

 

Thanks

post #738 of 775
Quote:
Originally Posted by pierg75 View Post
 

Hi,

I've got my new DOT I+ a week ago and since then I get a constant noise.
I've tried to change headphones (AKG K550, JVC S400 and some IEMs) and adapters but always getting the noise.
I've tried to change position (not near any other electronic device) but no help.

This is my fist tube amp and it might even be normal...but it's quite annoying.

Should I send it back or is this something I can easily adjust?

 

Thanks

Your tubes could need a burn in, if this does not help, supposedly switching opamps lowers the noise floor even more.

post #739 of 775

You could also make sure the jumpers are set to low gain.  I don't remember how they ship, but there are some jumpers on the inside of the amp that you can change yourself to switch between high and low gain.  Your tubes could require burn-in as stated above.  Also, the tubes could simply be bad.  When I got my LDI+ one of the tubes would buzz, so I replaced both with a better set.  What kind of sound are you hearing?  Is it like a hiss, a buzz, or something else?

post #740 of 775

I let now the amp to burn in with some files found in the forum.

 

It's like a hiss I guess (I'm not sure about the difference between hiss and buzz), it's constant, it doesn't change at the volume change.

 

I'll try also a new pair of tube and maybe a new opamp.

Any quick suggestion without reading the entire rolling guide? :)

 

Thanks

post #741 of 775

i've used my LD I+ with the following and it works well with my Grado 225i's

 

Opamp:

 

OPA2107

 

Tubes:

 

Sylvania Gold Brand 408A - These are harder to find and usually cost more than WE 408A

 

Western Electric 408A

http://www.tubedepot.com/nos-408a.html

 

Remember to change the jumpers for 408A type tubes if you switch from stock!  It's been a few years since I had OPA2107 and GB 408A combination, so I won't be able to give any comparisons to the stock tubes shipped with the I+.

post #742 of 775

Hi there!  im waiting for a Little dot i+ that i bought from a fellow headfier, he has the VOSHKOD 6ZH1P-EV tubes Matched and the OPA2107.. I read about the best OPA for the little dot and got from ebay the MUSES02..

 

I will still be on the search for the Sylvanias GB408a. but i think its a good setup for my Grados 225i. right?

 

 I was about to buy the new Schiit Vali but i heard alot of microphonic complains and honestly not sure if its a good match.. or a better match than the Little dot for my Grados that i will upgrade my headphones next year to a rs1 or HE500 not sure..


Edited by Pepe Silvia - 12/1/13 at 1:31pm
post #743 of 775

Finally sorted out some humming issues I was having with my LD1+ and now I'm in aurvana! 

 

MBP to cDAC+ to LD1+ with Telefunken EH900s (EF91). Got the OPA 2107 in there also. Can't go wrong!

post #744 of 775
I hear a constant static noise coming out of my little dot I + (bought one month ago). It is in both channels. I switched and changed the tubes.... i turned off all sources of interference... I moved the amp... I tightened the screws.... And I connected it directly to the electric outlet... and the static noise remains.

The static sound is louder at louder volume.... And even louder when the connected source (dac) is off! It begins to be heard when the volume is at 40 and becomes the loudest around 85.

When I remove the tubes, the noise disappears....

What should I do?
Edited by stephanemtl - 4/13/14 at 12:06pm
post #745 of 775

Is there an exhaustive list of all of the tubes that exist for the Little dot mk1+? Or at least what number tubes are equivalents of what, I am pretty new to this and get confused and its making it very difficult choosing tubes. If someone knows of anything. 

post #746 of 775
Quote:
Originally Posted by diphaloraptor View Post

Is there an exhaustive list of all of the tubes that exist for the Little dot mk1+? Or at least what number tubes are equivalents of what, I am pretty new to this and get confused and its making it very difficult choosing tubes. If someone knows of anything. 

http://www.head-fi.org/t/364043/little-dot-i-tube-rolling/0_30
post #747 of 775

That helps a bit, yes. And I have certainly seen the chart, I guess I just need more time for everything to sink in. 

post #748 of 775

Does Little Dot, I+ work well with low impedance 32 Ohm headphone like AKG K550?

 

What kind of tube is good upgrade  for Little Dot, I+ ?

post #749 of 775
Quote:
Originally Posted by boombobby289 View Post

Does Little Dot, I+ work well with low impedance 32 Ohm headphone like AKG K550?

What kind of tube is good upgrade  for Little Dot, I+ ?

Search the thread my friend. The little dot is renowned for playing well with low impedance cans like AKG and Grado. You can also find tubes suggestions all over the place if you do a little searching
post #750 of 775
Quote:
Originally Posted by boombobby289 View Post
 

Does Little Dot, I+ work well with low impedance 32 Ohm headphone like AKG K550?

 

What kind of tube is good upgrade  for Little Dot, I+ ?

 

A couple good choices to start with are the Western Electric 408A and the Sylvania 408A. In my experience the WE408A will warm up the headphones a bit, and the Sylvanias will open up the soundstage and give the sound a nice pleasant texture.

 

Have fun!

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