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UPGRADING THE CRYSTAL (X0) ON ESSENCE STX

May 7, 2010 at 3:08 PM Post #196 of 246
Hello. Have anybody recommendations for choosing an oscillator?
I'm going to order at mouser.сom all necessary details for tweaking
 
Is this XO ok? http://ru.farnell.com/fox/fxo-hc736r-24-576/osc-5x7mm-smd-cer-24-576mhz/dp/1641004?Ntt=FXO-HC736R-24.576
 
May 28, 2010 at 6:08 PM Post #197 of 246
 
KingFiercer, this is mine, but is under construction.... 
triportsad.gif

 
 
Hi everybody
Someone has experience with slowed sounds on STX ?
I change the 24.576MHz TCXO crystal oscillator on my STX, but all the sounds are slowed by 30%
What does it mean ?
I need help
 

Joy!
 
Sep 18, 2010 at 11:10 AM Post #200 of 246
I removed the original xo by using two irons simultaneously on the two pads (I would not try this using just one iron as you would end up overheating and possibly damaging the board), then I insulated the area with tape and soldered the new xo as pictured below.
Extending the gnd pin is not needed, as it would be long enough by bending it in the right direction.
 

 

 
Sep 23, 2010 at 8:33 AM Post #204 of 246
Yes, I'm using exactly the same golden crystal; the performance improvement (clarity) on my ST was rather minor, but still noticeable.  It's difficult to compare  without rolling back to the old xo.
 
Oct 7, 2010 at 2:16 AM Post #205 of 246
Hi All
smile.gif
...
 
I want to modify my STX X0 with Vanguard TCXO 24.576MHz 0.3ppm (like catx's X0 above)
But I am not a capable electronical person so I want ask few questions before, I hope somebody can answer them ...
 

 
After remove original X0 then :
1. Joint GND TCXO to point 1
2. Joint Output TCXO to point 2
3. Joint VDD TCXO to point 3
Are these correct steps? I see catx use VDD input at point 3 on his ST that I assume it provide TCXO with +5VDC
 
Thanks in advance
 
Oct 7, 2010 at 10:20 AM Post #206 of 246


Quote:
catx said:
I'm glad they helped you installing your new xo
smile.gif

What do you think of the performance? Did you use the same tcxo?
Click to expand...



Great pictures and mod.  Nice clean job.  I ahev been considering this mod myself but haven't got around to it yet.
Have you considered removing the coupling capacitors on the outputs.  This would also improve the sound further but is mainly for line output.
 
Oct 7, 2010 at 7:02 PM Post #207 of 246


Quote:
kinonotabi said:
Hi All
smile.gif
...
 
I want to modify my STX X0 with Vanguard TCXO 24.576MHz 0.3ppm (like catx's X0 above)
But I am not a capable electronical person so I want ask few questions before, I hope somebody can answer them ...
 

 
After remove original X0 then :
1. Joint GND TCXO to point 1
2. Joint Output TCXO to point 2
3. Joint VDD TCXO to point 3
Are these correct steps? I see catx use VDD input at point 3 on his ST that I assume it provide TCXO with +5VDC
 
Thanks in advance
Click to expand...


Correct, you can follow the instrunctions on message #95 but make sure you connect vdd input to a +5V source (for example output pin on the 7805)

 
Quote:
robscix said:
Great pictures and mod.  Nice clean job.  I ahev been considering this mod myself but haven't got around to it yet. Have you considered removing the coupling capacitors on the outputs.  This would also improve the sound further but is mainly for line output.
Click to expand...


 
Well, I listen to my hd 555 connected to the headphones amp output 99% of the time, otherwise I would surely give the coupling caps bypass mod a try.
At the moment I'm trying to find a good replacement for the original I/Vs, now I'm using some LT1028 on mono to dual converters but I don't like them, they are absolutely more neutral/natural than stock 2114Ds but they lack in soundstage and bass detail.
I'll give them some time to burn-in but I doubt it will make any noticeable difference.
smile_phones.gif

 
Nov 25, 2010 at 5:30 PM Post #208 of 246
Hello,
I bought a Vanguard TCXO 24.576MHz 0.3ppm for replacing an  orig. in my essence ST . I have changed it according to your advice. But I´m disappointed. The sound is worse then before. It is easy to compare. A resolution of instruments is lower, and Bass is not so deep like before. The Soundstage is narrow. I had to return the orginal back. It is weird. Can you advice what I should do. Maybe the crystal is fake. But hong kong  shop has good reference. 
 
May 2, 2011 at 10:47 PM Post #209 of 246


Quote:
gworldofspace said:
Here is a picture how to upgrade the clock crystal on stx!
1 POINT: unsolder the stock crystal
2 POINT: solder a wire to point 1(red mark) and connect to output of your new crystal
3 POINT: solder a wire to point 3(red mark) and connect to ground of the new crystal
4 POINT: solder DC 12V power supply wires to new crystal
THATS IT!
clockmod.jpg
Click to expand...

 
I'm trying to do this upgrade and I don't understand step 4 - what do you mean solder the 12V power supply to the new crystal? You mean that 4-pin connector you plug into the back of the STX?
 
 
 
May 9, 2011 at 12:47 AM Post #210 of 246
Just found this topic, great one btw.
 
About that +12V for clock/cristal, you cannot do that with Vanguard is rated +5V only!
 
I'll check my STX tomorrow to see where to get those +5V nearby, but the easy (and dirty) solution is still from Molex.
 
 
 
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