Sound of XOs

fmak · 5th April 2004, 04:41 PM

For sometime, I have been using the Tent and Euroquartz XOs with various very low noisr power supplies (5nV/sqrtHz to 50nV/sqrtHz).

These units improved sound quality but I was looking for fast, low phase noise units with symmetrical waveforms.

Found some Valpey-Fisher high spec units with 1 sigma phase noise specs of 1 ps. These really make a difference and improved considerably on previous XOs I have used.

Timing of music is better; better balance bewteen bass and treble; improved clarity and makes CD much more acceptable.

Anyone with similar experience?

Elso Kwak · 5th April 2004, 05:03 PM

Quote:

Originally posted by fmak
For sometime, I have been using the Tent and Euroquartz XOs with various very low noisr power supplies (5nV/sqrtHz to 50nV/sqrtHz).

These units improved sound quality but I was looking for fast, low phase noise units with symmetrical waveforms.

Found some Valpey-Fisher high spec units with 1 sigma phase noise specs of 1 ps. These really make a difference and improved considerably on previous XOs I have used.

Timing of music is better; better balance bewteen bass and treble; improved clarity and makes CD much more acceptable.

Anyone with similar experience?

Fred Mak,
Would be great if you could tell us the type number and where and how to get into the possession of these Valpey-Fisher XO's.

In my experience the symmetry of the waveform has very little influence on the sound.
Power supply does, and also the compatibility of the supply with the circuit used.
No need to hammer

jwb · 5th April 2004, 05:06 PM

You can buy these clocks directly from:

Dove Electronics
East Setauket, NY
631-689-7733

Mast Distributors
Ronkonkoma, NY
631-471-4422

But you may be required to purchase a large volume. I think these clocks are amazing.

tiroth · 5th April 2004, 05:21 PM

I once got a quote from VF of $135 for 100 units.

jwb · 5th April 2004, 05:22 PM

Yeah, considering the quality, the price is great.

jean-paul · 5th April 2004, 05:23 PM

Group buy ?

fmak · 5th April 2004, 05:40 PM

Quote:

Originally posted by tiroth
I once got a quote from VF of $135 for 100 units.

--------------------------------------------------------------------------------

Which are these? The top spec ones 20ppm; 2.5% symmetry; 1.5 nS rise time are £2.37 per 105; don't ask me why 105.

Not worth buying low spec stuff for diy purposes.

tiroth · 5th April 2004, 06:02 PM

Those were 50ppm I believe. Stability is really meaningless in this application. I got my quote direct from Valpey Fisher.

I have been on Jocko for some time about measuring one of these. Are you reading this Jocko?

He correctly points out that the 1ps spec is >1kHz. No one knows what the spectrum looks like to my knowledge.

I have a couple of these oscillators in Pgh, but I doubt anyone nearby has the proper equipment to measure them.

fmak · 5th April 2004, 08:09 PM

I got my quote direct from Valpey Fisher.

I have been on Jocko for some time about measuring one of these. Are you reading this Jocko?

He correctly points out that the 1ps spec is >1kHz. No one knows what the spectrum looks like to my knowledge.

I have a couple of these oscillators in Pgh, but I doubt anyone nearby has the proper equipment to measure them. [/B][/QUOTE]
-------------------------------------------------------------------
How do they sound to you? For a few dollars more, may as well get the best. I think symmetry should matter as the pulses define the trigger points. Mine have duty cycles within 1%! The best I have seen.

Jax · 6th April 2004, 12:04 PM

The reference is one of the edges, usually the rising. Pulse width is not important at all.

5th April 2004, 04:41 PM	#1
fmak diyAudio Member Join Date: May 2001 Location: London UK	Sound of XOs For sometime, I have been using the Tent and Euroquartz XOs with various very low noisr power supplies (5nV/sqrtHz to 50nV/sqrtHz). These units improved sound quality but I was looking for fast, low phase noise units with symmetrical waveforms. Found some Valpey-Fisher high spec units with 1 sigma phase noise specs of 1 ps. These really make a difference and improved considerably on previous XOs I have used. Timing of music is better; better balance bewteen bass and treble; improved clarity and makes CD much more acceptable. Anyone with similar experience?

5th April 2004, 05:23 PM	#6
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Group buy ? __________________ It's only audio

6th April 2004, 12:04 PM	#10
Jax diyAudio Member Join Date: Nov 2003 Location: South Sweden	The reference is one of the edges, usually the rising. Pulse width is not important at all. __________________ Jan

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5th April 2004, 05:06 PM	#3
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	You can buy these clocks directly from: Dove Electronics East Setauket, NY 631-689-7733 Mast Distributors Ronkonkoma, NY 631-471-4422 But you may be required to purchase a large volume. I think these clocks are amazing.

5th April 2004, 05:21 PM	#4
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	I once got a quote from VF of $135 for 100 units.

5th April 2004, 05:22 PM	#5
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	Yeah, considering the quality, the price is great.

5th April 2004, 06:02 PM	#8
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	Those were 50ppm I believe. Stability is really meaningless in this application. I got my quote direct from Valpey Fisher. I have been on Jocko for some time about measuring one of these. Are you reading this Jocko? He correctly points out that the 1ps spec is >1kHz. No one knows what the spectrum looks like to my knowledge. I have a couple of these oscillators in Pgh, but I doubt anyone nearby has the proper equipment to measure them.

5th April 2004, 08:09 PM	#9
fmak diyAudio Member Join Date: May 2001 Location: London UK	I got my quote direct from Valpey Fisher. I have been on Jocko for some time about measuring one of these. Are you reading this Jocko? He correctly points out that the 1ps spec is >1kHz. No one knows what the spectrum looks like to my knowledge. I have a couple of these oscillators in Pgh, but I doubt anyone nearby has the proper equipment to measure them. [/B][/QUOTE] ------------------------------------------------------------------- How do they sound to you? For a few dollars more, may as well get the best. I think symmetry should matter as the pulses define the trigger points. Mine have duty cycles within 1%! The best I have seen.

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