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Master Clock for your EtherREGEN


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Who here is using an external master clock with your EtherREGEN?  If so, what are you using and how would you describe the changes to sound quality compared with using the internal clock?

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I found the specs for the DAPU OCXO. Would very much appreciate your thoughts on phase noise and the other specs.

 

http://dptel.com/products-detail.php?ProId=2895

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3 hours ago, Superdad said:

If the O55A is really the clock module in your box then it’s a good bargain for $100.

 

Yes, it's my photo of my unit.

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9 minutes ago, Ponkbutler said:

Would you mind posting where you bought it, if that's not against the rules...

 

From AliExpress.

 

https://www.aliexpress.com/item/4000152539910.html?spm=a2g0s.9042311.0.0.795e4c4dGTiyce

 

Mine is the latest BG7TBL variant, dated 2019-12-09 and contains the DAPU OCXO.  No guarantees that others will be the same!

 

49948588412_d49ede6528_o.jpg

TP-Link MR6400 4G router > Uptone EtherREGEN reclocker > Sonore ultraRendu streamer > Mutec MC-3+ USB reclocker > Gustard X26 Pro DAC > Belles SA-100 power amp > Usher Dancer Be-20 speakers. AfterDark Giesemann master clock. PS Audio P3 & P10 regenerators.

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The output connectors are 50 ohm. I'm thinking of sourcing PCB mount 75 ohm sockets and swapping them.

 

Using short 75 ohm cables into 75 ohm ER and Mutec in sinewave mode doesn't seem to be harming the signal too much.

TP-Link MR6400 4G router > Uptone EtherREGEN reclocker > Sonore ultraRendu streamer > Mutec MC-3+ USB reclocker > Gustard X26 Pro DAC > Belles SA-100 power amp > Usher Dancer Be-20 speakers. AfterDark Giesemann master clock. PS Audio P3 & P10 regenerators.

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I may be wrong but I deliberately did not select a GPSDO because the complexity is tenfold. All that digital circuitry and ground plane noise for the immaterial benefit of zero long term drift. I didn't want any more noise on the clock outputs than absolutely necessary. There is also the faffing around with a GPS antenna out to the window.

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I've not seen any of the BG7TBL designs with 75 ohms off the shelf. Even with 50 ohm output I'm getting a substantive improvement and I'm going to try adapting mine for 75 ohm operation.

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40 minutes ago, basillus said:

Hmm interesting... I have the same BG7TBL Connected to my Gustard U16 and haven't tried it on the etherregen, because I figured it wouldn't be an improvement there.

Ok, now it must be tried, but just needed one more bnc cable ;0) and a better psu...

 

You must try it!  I found the effect of external clocking both my EtherREGEN and Mutec very impressive.  You should hear a similar doubling of the effect.

TP-Link MR6400 4G router > Uptone EtherREGEN reclocker > Sonore ultraRendu streamer > Mutec MC-3+ USB reclocker > Gustard X26 Pro DAC > Belles SA-100 power amp > Usher Dancer Be-20 speakers. AfterDark Giesemann master clock. PS Audio P3 & P10 regenerators.

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I now have a set of 75 ohm connectors to install.  I will then need to find how the oven output reaches the connectors.  It may be a simple resistor change, I don't know yet as I've been unable to find a circuit diagram.  If in doubt, I'll leave it alone as it sounds very good already but I will change the connectors.

TP-Link MR6400 4G router > Uptone EtherREGEN reclocker > Sonore ultraRendu streamer > Mutec MC-3+ USB reclocker > Gustard X26 Pro DAC > Belles SA-100 power amp > Usher Dancer Be-20 speakers. AfterDark Giesemann master clock. PS Audio P3 & P10 regenerators.

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I don't have variable output?  I use both sinewave outputs and am not using the squarewave output.

 

When I open it up to change the connectors to 75 ohm, I will see what I can find with regards to output impedance.

 

I'll say again: it's clearly not a major issue driving two devices using short 0.5m 75 ohm cables despite the clock being 50 ohms in stock form.

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35 minutes ago, k-man said:

Another consideration will be to exchange a 75 ohm EtherRegen with a 50 ohm version.

 

For me, that wouldn't solve the problem as my Mutec MC-3+ USB is also 75 ohm.

 

It works well now but I'll exchange the BNC connectors when I have a little free time.

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Either could potentially feed the BNC connectors, I would trace back using a meter to see whether they are the line impedance resistors.

I shall pull my board out soon, I'm just waiting for some ceramic decoupling caps to arrive.

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7 hours ago, Superdad said:

 

Actually, the EtherREGEN prefers squarewave input.  Since you have both, why don’t you go ahead and compare them? :)

 

Thanks - I will try it once I've got the impedance sorted. I hope I'm right in thinking an impedance mismatch affects a squarewave worse than a sinewave.

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John, I do believe you're right. I've just switched the ER over to squarewave, leaving the Mutec on sinewave. There is a little more soundstage 'presence' and low level detail and the bass is a touch tighter. This is still with the mismatch at the clock socket/cable boundary.

 

When I receive a BNC T-connector, I'll be able to get my scope on the waveform and see how distorted it looks. My ears tell me that it's an improvement, though.

TP-Link MR6400 4G router > Uptone EtherREGEN reclocker > Sonore ultraRendu streamer > Mutec MC-3+ USB reclocker > Gustard X26 Pro DAC > Belles SA-100 power amp > Usher Dancer Be-20 speakers. AfterDark Giesemann master clock. PS Audio P3 & P10 regenerators.

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Some detail of my BG7TBL PCB.  I have swapped two outlets to 75 ohm BNC connectors, leaving one sinewave outlet at 50 ohms.

 

Top side.

 

50010483086_138bcbbab2_o.jpg

 

Underside.  Note the PCB is dated later than my rear panel, 2020-03-13.

 

50009950948_5db58d5c04_o.jpg

 

Detail showing ceramic bypass capacitors added.  There is only just enough clearance in the case, it's a tight fit.

 

50009951308_757e49564f_o.jpg

 

 

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6 minutes ago, zerung said:

 

 

@MartinT is this after the conversion of the clock to 75 Ohm? Incidentally the seller from Taobao is willing to change the system to use the Morion Clock and also change the connector to 75 Ohm, etc.

 

Yes, I'm getting a little more now but even in stock form it was worth the purchase.

 

If you can get it supplied in 75 ohm form then go for it as swapping those connectors wasn't easy.

 

How do you know the Morion clock is better than the DAPU?

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That's the frequency adjustable model.  Can they not provide 75 ohms in the fixed model, like mine?

You want the least complexity inside that you can go for.

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4 hours ago, Savolax said:

 

I ordered the same unit. Just received and opened it. The one I have is also 2019-12-09 and includes the same DAPU OCXO inside. I will be using it being connected to Magnafied Singxer SU-1 (sCLK-EX tweaked). I'm eager to get it compared vs the sCLK-EX clocks. 

This sCLK-EX mod provides me an extra DC-out via SU-1 which I will be using to power this clock unit. Modded SU-1 is powered by Farad3 12V.

 

Try both the sinewave and squarewave outputs into the ER and let me know what you think.  Don't forget to power up the ER after you're changed the switch to external clock.

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3 minutes ago, zerung said:

 

Is that an external filter? I am not sure how to do this? As far as I know this only come with square wave as a standard

 

 

Look at your front panel: from left to right, the BNC outputs are squarewave, sinewave, sinewave.

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Ah sorry, I was looking at Savolax's photo above, which is the same as mine.

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8 minutes ago, zerung said:

With my system, the ER and the clock make an alarming upgrade.

 

I completely agree.

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On 6/18/2020 at 3:19 PM, zerung said:

He is having trouble sourcing a 75Ohm BNC binding post that will fit his circuit board. 

 

https://www.ebay.co.uk/itm/RF-COAXIAL-BULKHEAD-BNC-Coaxial-RECEPTACLE-R-A-75-OHM-SOLDER/293400270378?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2648

 

s-l1600.jpg

TP-Link MR6400 4G router > Uptone EtherREGEN reclocker > Sonore ultraRendu streamer > Mutec MC-3+ USB reclocker > Gustard X26 Pro DAC > Belles SA-100 power amp > Usher Dancer Be-20 speakers. AfterDark Giesemann master clock. PS Audio P3 & P10 regenerators.

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