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UPGRADING THE CRYSTAL (X0) ON ESSENCE STX - Page 9

post #121 of 238
Any XO would work that is meant for this type of application. The gains come from the newer units being of a higher quality then the unit your replacing.
The tent labs units should install in a similar fashion to the Vanguard unit Thoppa installed. I have never used the tent labs units so I cannot say anythign about their quality for such a modification.
post #122 of 238
I hope Marko will describe the other XO.

He has an STX card, and I have an ST. The layout is different, plus his card is now external and mine is still internal.

For the ST, the Vanguard is well-sized and excellent quality. It is 1ppm and about 2ps jitter (-125db at 1khz; the maths I read elsewhere says -118dB is the same as 4ps jitter, so -6db is half that). It's very low-jitter and very stable too. It costs US$25 on Ebay.

Ultra precision 1ppm 24.576MHz TCXO crystal oscillator on eBay (end time 17-Sep-09 08:49:31 BST)

I got mine from a local shop. Same price.

V.A. Hi Fi www.VocativeAudio.com The advanced Hi-Fi shop in China-Hong Kong

I used a 12-pin socket. I removed all but 3 of the pins. These remaining pins I carefully bent (they break easily) so that the XO in the socket sits about 1.5mm above the height of the shield and doesn't interfere with my PCI-e VGA card in the adjacent socket in my PC. (It's an Asus T4 barebone with only one PCI-e socket and one PCI socket, two hard drives, okay PSU, etc. ASUSTeK Computer Inc. ) I needed a short hook up wire and this was one of the tricky things to get right. Removing the original XO can be tricky too.

Do you have an ST or STX ?

A Tent Labs requires a power supply circuit of its own and costs considerably more partly because of this. I have a Tent labs XO in my SACD player :

Pioneer DV-575A, -578A, -585A und -588A Hires SACD and DVD-A digital output DIY-Kit

It's excellent but tbh the Vanguard is too, plus it's simpler and much better value for money.

Hope this helps.
post #123 of 238
Thread Starter 
In my essence I have installed the audio-gd JZ-1 crystal whit its own PSU.
Here is the link:н¨ÍøÒ³ 1
Its pretty cheap, only 22,5$ and I think its the same design as bursons clock!
Its a 5ps clock!
post #124 of 238
I very much doubt anyone can hear the difference between these two XOs. Although Marko's might have a tiny bit more jitter, ( does it ? ) it has its own power so it won't be suffering from voltage fluctuations as much as mine is. Then again, the ST has a CS2000 jitter reduction circuit said to reduce jitter "by 31%" according to Asus. So really, it seems no 'real audible' difference in performance is the most likely conclusion.

But he has discrete op-amps....ah....if only I had the space in my PC.....
post #125 of 238
..I am using some custom built discretes that are much smaller...
post #126 of 238
Quote:
Originally Posted by thoppa View Post
. . . Do you have an ST or STX ? . . .
I will be getting an ST and the multichannel card as soon as they are released in the US. While I'm waiting, I have been ordering opamp samples. It looks fairly easy to change the XO on the ST so I might order one of the Vanguard ones.
post #127 of 238
Quote:
Originally Posted by ROBSCIX View Post
..I am using some custom built discretes that are much smaller...
ooohhh, sounds good... ;-) but how small ? I assume they wouldn't fit under the shield....but maybe they can be installed from the other side ? I have about 40mm space on the other side of the card...

Can you post a link or details pls ? Thanks !
post #128 of 238
Quote:
Originally Posted by mojave View Post
I will be getting an ST and the multichannel card as soon as they are released in the US. While I'm waiting, I have been ordering opamp samples. It looks fairly easy to change the XO on the ST so I might order one of the Vanguard ones.
Yeah, I'd say the Vanguard is gonna be the best for the ST, all things considered.

I bet you're getting a little frustrated with Asus U.S. eh ?
post #129 of 238
No, not quite that small. I will talk to the other people involved and let you know what I can.
post #130 of 238
Thread Starter 
Thoppa!
I would suggest you to put the discrete opamps to the other side of the board.
Thats the best solution if you dont have space.
post #131 of 238
It has been a little frustrating waiting so long in the US. I plan to update the motherboard, processor, and memory of my HTPC when Windows 7 is released so I guess I can wait a little longer and do it all at once.

I purchased the Vanguard TCXO and now I need to find a socket. Where is the best place to find one?
post #132 of 238
You can get one from Radio Spares, Digi-key, etc, or just ask the vendor to send you one for free. They cost next to nothing.

I know the feeling of waiting for gear. It can drive you nuts eh ?
post #133 of 238
Thanks Rob and Marko - mini-discretes please !
post #134 of 238
Quote:
Originally Posted by thoppa View Post
Thanks Rob and Marko - mini-discretes please !
No problem. I am working on it.
post #135 of 238
Thread Starter 
You could also just bypass the opamps and use an external discrete I/V stage and a buffer stage! What do you think?
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