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UPGRADING THE CRYSTAL (X0) ON ESSENCE STX
May 9, 2011 at 3:10 PM Post #211 of 246
I took a look on my STX, there is two power regulators (one for 12V and one for 5V):
 
5V@1A is a AZ7805D (TO-252) marked as U20:
http://www.bcdsemi.com/ASP/productpic/2004981742391148.pdf
 
12V is a 7812 (TO-252) marked as U24.
 
X1: 24.576MHz @ 5V (so called crystal or TCXO).
 
I'm planning to change OPAs too.
 
1st option LME49720HA+OPA2111SM.
2nd option 2xOPA-Earth + 1xOPA-Sun
 
And of course the crystal.
 
Last mod would be the capacitors to Premium type (better than Fine Gold).
 
About the OPAs, what's better?  1st option or 2nd one?
 
Oct 31, 2011 at 11:14 PM Post #213 of 246


Quote:
catx said:
I've just upgraded my ST with the 0.3ppm Vanguard you can find on ebay
 
 
 
 
Sound improvement is definitely huge!
smily_headphones1.gif
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Hi catx, please can you tell me in which way the sound is better? I'm thinking on getting one of this cards... so your impressions would be great :D 
 
Nov 6, 2011 at 1:36 AM Post #214 of 246


Quote:
thoppa said:
BTW, have you measured the output DC offset on the output without the coupling caps ? I imagine it's quite high (2 volts dc or more ?) but I assume that you are feeding the signal into gear that has input coupling caps ?

My card is finished. I'd say the XO made the biggest difference, replacing the ceramic feedback caps and using a linear PSU were tied for second. Replacing the output coupling caps comes a close third. Replacing the decoupling power caps came last. After all the changes, I rolled my fave op amps for a week or two and I settled on LME49720HA in the I/V and AD8620BR in the buffer.
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Actually all my amps are D.C. coupled & are capable of amplifying D.C.. I found that by direct coupling the line out of the Essense STX card you can actually reduce the D.C. offset of any direct coupled or D.C. coupled amp from the output of practically any such amp following it.
 
 
Nov 30, 2011 at 7:22 PM Post #215 of 246
Hi, is this the vanguard clock you recommend for an asus xonnat st?
http://www.ebay.com/itm/Vanguard-Ultra-precision-Golden-TCXO-0-3ppm-24-576MHz-/120763673234?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item1c1e136a92#ht_2171wt_1163
 
Feb 19, 2012 at 12:43 PM Post #217 of 246
Has any other guy changed the crystal,so as to tell us what the quality upgrade is?I have a ST card,having changed the opamps only.
 
Feb 29, 2012 at 3:30 AM Post #219 of 246
 
I am ready to change the crystal on my essence ST but I have this question.
 What is the difference between:
Vanguard Ultra precision Golden TCXO, 0.3ppm 24.576MHz and Vanguard Ultra precision TCXO 1ppm 24.576MHz.       (both found on ebay)
And which is better.
 
Mar 9, 2012 at 11:15 AM Post #222 of 246


Quote:
theodore said:
Has any other guy changed the crystal,so as to tell us what the quality upgrade is?I have a ST card,having changed the opamps only.
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The best way to keep constant the frequency is to maintain the temperature at 25 degrees Celsius and filter feeding by intermodulation. After the above we can change and the local oscillator.Then, perhaps! you can hear the difference.
 
---The best way it's the only way--- !!! 
 
Apr 20, 2012 at 8:09 AM Post #224 of 246
Hi everyone!
 
I am about to upgrade my STX situated in a GZ-M1 box from Gigabyte
The space left from the sidecover to the cards is 37 mm , and from card top to my video card is 28 mm
Is there any chance to build in a burson discrete set, or change to ST, place the card to an upper pci socket?
(The card above the stx is an XTREME MUSIC with PCI slot)
 
Thanks!
 
 

 
 
 
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