NEW Vali Schiit AMP!!!
post-10049041
Post #2,086 of 4,971

bigbenrfan99

100+ Head-Fier
Joined
Mar 27, 2013
Messages
409
Reaction score
51
Location
Harrisburg, PA
Joined
Mar 27, 2013
Location
Harrisburg, PA
Posts
409
Likes
51
I am looking into possibly getting a Vali for my DT 880 250 ohm, but I have a few questions.  Is there any problem with using the Hifimediy Sabre DAC with the Vali?  I already have the 3.5 mm to RCA cable that I would need, but I am wondering if I would be losing something in comparison to using a DAC with an RCA output.  If anyone has thoughts on this, how does the Vali compare to the slightly cheaper Bravo Audio Ocean and the somewhat more expensive Little Dot MK II?
 
     Share This Post       
post-10049071
Post #2,087 of 4,971

hans030390

1000+ Head-Fier
Joined
Dec 4, 2008
Messages
1,372
Reaction score
604
Joined
Dec 4, 2008
Posts
1,372
Likes
604
 
DO NOT USE Vahalla with low impedance cans like orthos. The Vahalla output impedance is almost as high if not higher. It will sound bad. I have tried it for fun just to see. Just a bad idea and even Schiit recommends against this on their website.
 
Not to get too OT, but this has always confused me. As of late, I thought the output impedance on amps didn't matter so much with orthos, since most have a flat impedance curve. At least, that was what I was told when I asked why a vintage receiver with a super high output impedance still drives orthos well...
 
     Share This Post       
post-10049094
Post #2,088 of 4,971
Joined
Jun 9, 2010
Messages
2,722
Reaction score
19,375
Location
Newhall, CA
Joined
Jun 9, 2010
Location
Newhall, CA
Posts
2,722
Likes
19,375
Website
www.schiit.com
Regarding the tube foam--actually, heat won't hurt it--it's rated to 65 degrees C continuous.
 
I suspect what's happening with the loose tubes is cold weather. During shipping, if it gets cold, the adhesive gets less effective, and might come unstuck. I've talked to the board house already and all production is now shipped with bent, strain-relieved tube leads to help eliminate the problem.
 
And--if you choose to re-stick them, don't worry about touching the tubes. They run at room temperature. The only parts that get hot are the large transistors for the Class AB output stage. We push the tubes down, hard, by hand, during production.
 
Schiit Audio Stay updated on Schiit Audio at their sponsor profile on Head-Fi.
 
https://www.facebook.com/Schiit/ http://www.schiit.com/
post-10049096
Post #2,089 of 4,971

Robobandit

New Head-Fier
Joined
Sep 13, 2011
Messages
46
Reaction score
14
Joined
Sep 13, 2011
Posts
46
Likes
14
Thanks for the response, Jason :)
 
     Share This Post       
post-10049105
Post #2,090 of 4,971

CJ_CoCa

New Head-Fier
Joined
Nov 21, 2005
Messages
35
Reaction score
0
Joined
Nov 21, 2005
Posts
35
Likes
0
  I've talked to the board house already and all production is now shipped with bent, strain-relieved tube leads to help eliminate the problem.
 
Now I'm wondering if mine is one of those...it was shipped on Thursday/Friday ...
 
Either way, I'm really excited to pair it up with my incoming HE-400 as well!
 
     Share This Post       
post-10049124
Post #2,091 of 4,971

Transformatron

100+ Head-Fier
Joined
Jun 22, 2012
Messages
291
Reaction score
26
Joined
Jun 22, 2012
Posts
291
Likes
26
Regarding the tube foam--actually, heat won't hurt it--it's rated to 65 degrees C continuous.

I suspect what's happening with the loose tubes is cold weather. During shipping, if it gets cold, the adhesive gets less effective, and might come unstuck. I've talked to the board house already and all production is now shipped with bent, strain-relieved tube leads to help eliminate the problem.

And--if you choose to re-stick them, don't worry about touching the tubes. They run at room temperature. The only parts that get hot are the large transistors for the Class AB output stage. We push the tubes down, hard, by hand, during production.
This won't affect the warranty right?
 
     Share This Post       
post-10049146
Post #2,092 of 4,971

tdockweiler

Headphoneus Supremus
Joined
May 1, 2007
Messages
6,912
Reaction score
316
Location
Portage, Michigan
Joined
May 1, 2007
Location
Portage, Michigan
Posts
6,912
Likes
316
This won't affect the warranty right?
 
Probably will void the warranty if you choose to fix it yourself. That is unless Schiit authorizes it, which probably won't happen.
 
     Share This Post       
post-10049148
Post #2,093 of 4,971

TheGame

100+ Head-Fier
Joined
Oct 5, 2012
Messages
244
Reaction score
22
Joined
Oct 5, 2012
Posts
244
Likes
22
This won't affect the warranty right?

Yes I am wondering this too. Since I have the constant ringing in the left channel I suspect one or both tubes has come loose from the pads, but I am reluctant to open the unit fearing that it will void the warranty, even though it seems like a pretty easy fix. As to what Jason from Schiit said about the cold, to me makes perfect sense. When I received my Vali, it was very cold, I actually waited for the unit to warm up to room temperature before turning it on the first time.
 
If pushing the tube back on the foam carefully with a little pressure will fix the issue then I would much rather do that then have to contact Schiit and bother them with something I could easily fix myself, however I do not want to do anything if it will void the warranty.
 
Edit: I used an LED flashlight to look inside the top of the Vali through the holes and I can see the left tube is definitely up off of the foam, the tube on the right looks like it still may be attached to the foam, but it is difficult to get a good look at it without having to open the unit, which I am afraid to do.
 
     Share This Post       
post-10049194
Post #2,095 of 4,971

BournePerfect

Headphoneus Supremus
Joined
Aug 25, 2010
Messages
2,872
Reaction score
157
Joined
Aug 25, 2010
Posts
2,872
Likes
157
Poor match on paper-but worth a shot. Someone here keeps posting about their W1000x, maybe search out those posts.
 
-Daniel
 
     Share This Post       
post-10049202
Post #2,096 of 4,971

lostinthesauce

100+ Head-Fier
Joined
Feb 14, 2013
Messages
247
Reaction score
36
Joined
Feb 14, 2013
Posts
247
Likes
36
  Poor match on paper-but worth a shot. Someone here keeps posting about their W1000x, maybe search out those posts.
 
-Daniel
Thanks for the feed back; would there be another tube'd amp that you'd recommend for the AD900X?
 
     Share This Post       
post-10049210
Post #2,097 of 4,971

Maxvla

Headphoneus Supremus
Joined
Dec 26, 2002
Messages
8,565
Reaction score
633
Joined
Dec 26, 2002
Posts
8,565
Likes
633
I would assume since Jason is telling you to do it, if it is needed, that there won't be any warranty repercussions. Correct me if I'm wrong, though, Jason.
 
     Share This Post       
  • Like
Reactions: JoeKickass
post-10049255
Post #2,098 of 4,971

heart banger-97

100+ Head-Fier
Joined
May 29, 2011
Messages
328
Reaction score
18
Joined
May 29, 2011
Posts
328
Likes
18
Hey guys

I need some technical information. I'm not so aware of electronic science so keep calm if my question isn't fault free.

I know that tubes need to reach an optimum voltage to work their best, so what is the optimum Impedance for using with Vali?

I realy appreciate any advice (theoretical or practical) that you guys can give me.
 
     Share This Post       
post-10049414
Post #2,099 of 4,971

K.T.

100+ Head-Fier
Joined
Apr 18, 2003
Messages
458
Reaction score
57
Joined
Apr 18, 2003
Posts
458
Likes
57
I used to use a leather punch to make small dots out of this vibration damping material:

http://www.partsconnexion.com/damping_soundcoat.html

I would place them on primarily around circuit boards. Other times I would use larger strips or sheets inside sheet metal chassis.

Sometimes there was no change to the sound; sometimes the sound changed to my liking, and sometimes it was worse. Hard to say until you've messed around a bit.

Since the tubes run at room temperature, I don't see any harm in trying something like this on the glass envelope of the tubes. Again, it's unpredictable how it will affect the sound. Since these tubes are extremely sensitive to vibration, I would think it would have some effect, whether for better or worse.

I've long since run out of this stuff, but I'm tempted to get more and try it.
 
     Share This Post       
post-10049461
Post #2,100 of 4,971

purrin

aka Marvey, purr1n
Member of the Trade: Eddie Current
Joined
Aug 2, 2008
Messages
5,408
Reaction score
1,292
Joined
Aug 2, 2008
Posts
5,408
Likes
1,292
   
Not to get too OT, but this has always confused me. As of late, I thought the output impedance on amps didn't matter so much with orthos, since most have a flat impedance curve. At least, that was what I was told when I asked why a vintage receiver with a super high output impedance still drives orthos well...
 
Think current delivery / power transfer. Tubes are high voltage and low current devices. Think water spraying from thin pipe with high pressure. Low Z orthos need current. Think huge diameter pipe receptacle which doesn't expect a lot of pressure.
 
Most tube amps use a transformer which lowers the voltage and trades that voltage for current. In other words, the transformer a gizmo which converts the the thin pipe to a thicker pipe. Vahalla is an OTL, so no such luck. It's like using a Water Pik to clean your bathtub, when buckets of water dumped on it are more effective.
 
As for why vintage receivers work well I have no idea. I've only used low Z power amps. It's possible the receivers just have that much more power to be able to push through that small pipe (resistor at phono stage).
 
     Share This Post       

Users Who Are Viewing This Thread (Users: 0, Guests: 2)

Top