[keph]

It's actually quite easy to change the resistors if you have soldering skills. Newer models have the 1Kohm or higher value resistor, Mine came with a 1,3Kohm resistor that is why it's under powered for my LCD. But when I changed it with a 270ohm resistor, Everything changes. 

 
My guess will be around the year 2005-2006 when they did the new reversion of the amp using the WBT binding post that's also when they changed the Headphone out resistors.

 

[dminches]

It is much later than that. I bought mine in 2011 and it clearly has the lower resister.

 

[dminches]

It is a bad design decision on their part.

 

[keph]

Quote:

Two different versions of the Leben CS300XS headphone output!
 
I asked Leben about why the HD650 (103dB)  is humming on my Leben CS300XS, whilst my less sensitive Audeze (LCD-2rev.1/3 - 93db) and HiFiman HE500 (89dB) cans are not:
 
Here's the answer from Leben
 
 
 
 
Attached diagram:
 

 
Quote:

What this also implies is that one can, if one is willing to do so (or make someone capable do it for you) - actually make another headphone socket and have to sockets: One high and one low sensitivity output. 

 
There ya go...you can actually make them if you are willing to..

 

[keph]

Quote:

It is much later than that. I bought mine in 2011 and it clearly has the lower resister.

 
Mine was produced in the late 2010 and got the 1,3Kohm resisitor..soo i guess they just randomly install them?

 

[dminches]

That is very odd. Mine is a 120v model. Is yours?

 

[keph]

Quote:

That is very odd. Mine is a 120v model. Is yours?

 
mine is 220V..

 

[keph]

got some info about the CS300F model http://www.my-fi.nl/LEBEN%20CS-300F%20www.My-Fi.nl.pdf

 

[dminches]

Besides the different tube compliment, what are the other differences in specs?

 

[MorbidToaster]

I like the HD800 more than the LCD 2/3 anyway.
Quote:

It is a bad design decision on their part.

 

[toschek]

So, what's a good price to be looking for one of these for (used)?   I'm looking for the CS-300SX or the original CS-300.

 

[MorbidToaster]

The 300XS runs around 4k new...So I'd go by that. 
 
Quote:

So, what's a good price to be looking for one of these for (used)?   I'm looking for the CS-300SX or the original CS-300.

 

[toschek]

So 4K for a used one? Seems a bit high, but if you think so. I was just wondering because all of the head-fi classifieds don't have pricing any more.

 

[MorbidToaster]

No no, they're NEW at 4k. 
 
Quote:

So 4K for a used one? Seems a bit high, but if you think so. I was just wondering because all of the head-fi classifieds don't have pricing any more.

 

[toschek]

So like $2.8k - $3.5 used?  Does that sound about right?