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The Leben CS300XS Thread - Page 111

post #1651 of 2112
Quote:
Originally Posted by Dr. Roberts View Post

"Speaker amp designers typically tune their products for speakers, and pay only moderate attention to headphones. Obviously for economic reasons (smaller market), but also for technical reasons (much more variety of headphone behavior in terms of impedance compared to speakers) and due to a lack of understanding of the headphone aficionado market.The CS600 is just an example of this trade off. It is definitely not marketed/sold as a headphone amp - although it performs very nicely with a very minor adjustment."

 

An interesting post on a site devoted to said "headphone aficionados".

 

The fact is that there are many more audiophiles that listen to loudspeakers than those that listen to headphones. I did not purchase the CS-600 to listen to cans, very rarely plug a headphone into the output jack of the Leben, and have commented before that the CS-600 is a wonderful amp when paired with synergistic speakers, but this site is specific to headphone users and prospective buyers of Leben gear should know as many pertinent facts as they can before plunking down their hard-earned dollars. There are hundreds of comments on this site regarding the use of a Leben integrated and headphones, the vast majority being of a positive nature. There are also several posts commenting on the "low level hum" that is experienced by many. Some of those making such comments rule out the usage of a Leben as a headphone amplifier because to them, listening to headphones with the amp humming away in the background is unacceptable.

 

My question would be, if this so called fix is a "minor adjustment", why is it not performed at the factory before the unit is unleashed on an unsuspecting public? It is not a QC issue. The problem is well known, has existed for some time, and it remains unresolved.

Most if not all tube amps have a slight hum if you turn up the volume with no input

Who listens to nothing? If a perfectly black background is all that is important then get a SS amp

And under that condition with no input most SS amps will exhibit a slight hum or hiss too.

As a Engineer I would like to know what this simple fix is?

post #1652 of 2112
My CS300XS is dead silent with all headphones, and that includes those high sensitivity headphones like HD650, AT-AD2000, ATH-AD700, Grado SR-60.
post #1653 of 2112
Sorry, double post.
post #1654 of 2112
Quote:
Originally Posted by Skylab View Post

What drew me to the Leben in the first place is that the headphone out is drive off the same output transformer as speakers. In essence, except for the different impedance from the secondary winding, the headphone out and the speaker out of the Leben are identical.  

 

MANY dedicated tube headphone amps hum with low impedance high sensitivity headphones.  This isn't unusual.  I can only very barely hear any hum if I really strain to even with my ATW3000ANV, and that's with no music playing.  Hardly a big deal.

 

Lots of choices for headphones these days, something like either Leben probably makes the most sense for someone who will use it with speakers, but I still think its pretty special with headphones.  

+1 - excellent summary in far fewer words than my verbose posts...

post #1655 of 2112
Quote:
Originally Posted by MorbidToaster View Post

If you ever get antsy for another amp the Line Magnetic gear is fantastic with the Devore stuff I've heard.

 

As for a new amp for the HD800...I'd try to get a hold of a Cavalli Liquid Glass when you do (inevitably) want a new amp. Best I've heard the HD800.

 

I almost did the same thing you did with my system, too. I walked in, heard the system as a whole (including the turntable) and have bought almost the entire thing. I had to force myself to listen to other stuff 'just in case the Leben wasn't the best'. Ended up not being necessary.

 

Agreed on LM. They were just getting established in the US when I got the Leben, so they were not on my radar screen. But I see very little reason to change at this point.

 

A new HD800 amp is quite low on my list at this point (waiting for BHSE, hunting for a DAC), but the LG is on the list. Quite a few good choices out there: LG, ZDSE/ECBA, GS-Xv2, BHA-1. The market is moving fast enough that I don't want to spend too much time searching before I am ready to upgrade.

 

Listening to other stuff is the right approach... I normally do that, and had done some serious research before, but I did get bowled over by the CS600/O96 combo. No regrets whatsoever.

post #1656 of 2112

More Bad (but easily fixed news): One of my EL84s has bit the dust. No more Leben til Wednesday.

 

Gotta go pick up a replacement from Brian.

post #1657 of 2112
Quote:
Originally Posted by MorbidToaster View Post

More Bad (but easily fixed news): One of my EL84s has bit the dust. No more Leben til Wednesday.

 

Gotta go pick up a replacement from Brian.

 

I was under the impression you need to match your output tubes so if one goes, you need to replace them all ...

post #1658 of 2112
Quote:
Originally Posted by MorbidToaster View Post

More Bad (but easily fixed news): One of my EL84s has bit the dust. No more Leben til Wednesday.

 

Gotta go pick up a replacement from Brian.


What? Is this from a recently purchased NOS stock of EL84s?

post #1659 of 2112

It's the stock tubes. One went out.

 

Quote:
Originally Posted by Clayton SF View Post


What? Is this from a recently purchased NOS stock of EL84s?

post #1660 of 2112
Quote:
Originally Posted by vert View Post

Furutech fuse: slow, 6.4mm x 30mm, 2A

 

I paid about $47 plus shipping from Acoustic Sounds, but I would recommend purchasing it from a place like Music direct that allows returns just in case.

 

The only thing is it's a bit warm sounding. But once you've had it in your system for a week, I don't think there's any going back.

 

After hours of scouring the Internet looking for this 6.4mm x 30mm size and finding absolutely nothing, I finally took the chance and bought the widely available slow, 6mm x 32mm, 2A Furutech fuse.  Lo and behold, it doesn't fit.  I know, I know.  Facepalm.  :redface:

 

Where are you guys finding this 6.4mm x 30mm size?  I looked on Furutech's own site, Acoustic Sounds, Music Direct, VH Audio, eBay, etc.  Am I blind?


Edited by dsticker - 3/26/13 at 5:48pm
post #1661 of 2112
My Leben CS300xs doubles for both speaker & h/p duties - tend to use it a little more frequently with my Zu Superflys - however yesterday I gave the TH900 a run on the Leben again using my well tempered simplex TT with zu D103 cart as front end, using a Clearaudio nano as phono stage and listened to the Underworld track Spikee on 33.3 half speed album - it was quite the exerience - revealed tons of detail ( more than the Zu's), über fast decay, plenty of excitment and allowed me to move with cut as if going on a ultra smooth motorcycle ride complete with twists & turns followed by the amazing ecstatic gitar overlay which kicks in after about 10mins 26secs - Skylab is on the money - this amp is absolutely outstanding
post #1662 of 2112

Good choice on the Soul Superfly. I heard them when auditioning Harbeths and if I hadn't had tons of money to blow I may very well have gotten them.

 

Quote:
Originally Posted by mrtim6 View Post

My Leben CS300xs doubles for both speaker & h/p duties - tend to use it a little more frequently with my Zu Superflys - however yesterday I gave the TH900 a run on the Leben again using my well tempered simplex TT with zu D103 cart as front end, using a Clearaudio nano as phono stage and listened to the Underworld track Spikee on 33.3 half speed album - it was quite the exerience - revealed tons of detail ( more than the Zu's), über fast decay, plenty of excitment and allowed me to move with cut as if going on a ultra smooth motorcycle ride complete with twists & turns followed by the amazing ecstatic gitar overlay which kicks in after about 10mins 26secs - Skylab is on the money - this amp is absolutely outstanding
post #1663 of 2112

Oh, and I went to my dealer today and he confirmed that you DO NOT have to have a matched quad for the Leben. He said it'd be fine to just throw another Sovtek in there and let the amp do the work.

 

That being said, he didn't have any Sovteks on hand (he thought he did) so he gave me a new quad of JJs EL84. I've heard mixed things between these 2 when it comes to EL84s and don't really care one way or the other.

 

I'm hoping to eventually roll in something else and keep this quad as a backup anyway.

post #1664 of 2112

^ And I am hoping that once you get those JJs installed that you'll be able to enjoy the Leben for the music without anymore undue distractions.

post #1665 of 2112

Seems fine so fa. :)

 

Have a friend over and we've been jamming since noon. Driving 'em hard right out of the gate.

 

EDIT: Lost a few days worth of speaker run in because of this as well, but no worries. Friend brought his camera so I got some kickass dark shots of the Leben's tubes a glowin' before I put the top back on.

 

Quote:
Originally Posted by Clayton SF View Post

^ And I am hoping that once you get those JJs installed that you'll be able to enjoy the Leben for the music without anymore undue distractions.

 

Oh, and to anyone interested in Lebens. I saw a picture of the new enclosure for the new 300 and 300XS. It has a rectangular power switch and a purple top for the amp. They're using the new case for the XS as well because the parts they used in the current XS were extending wait times by being hard to find. Guessing it's a simple knob swap otherwise (when it comes to aesthetics).


Edited by MorbidToaster - 3/27/13 at 3:10pm
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