rowemeister said:
Hey Brent,
I see you used two C2's and not the divider output for the servo. But you probably have some laying around 😀. Very nice PCB, how does it sound??
I'd love to do a jitter measurement on it, see what it does.
Ray
Hi Brentrowemeister said:
Nice work "again😉 "
Also like the evolutions on your site. (Did you mod the ATC amp ?)
Just a small issue: While browsing your site, the menu (blue drop down style on the left) keeps appearing in the midle of the screen so I can not read all the info.....
Is it my pc or did you notice it also ?
Ricardo
PS: Do not forget to post the preamp schematics.
RCruz said:Just a small issue: While browsing your site, the menu (blue drop down style on the left) keeps appearing in the midle of the screen so I can not read all the info.....
Hi Ricardo,
What browser and screen resolution do you use, please?
Simon
Hi Ray
So far on everything the clock has run on the sound stage has opened up and detail has raised quite alot.
Lee has used one in his cd94 and now in a cd17KI and seems very pleased with it.
I have used 2 clocks (I had 2 Audiocom clocks before) as I have two psus for the clocks and wanted to utilise these.
Brent
So far on everything the clock has run on the sound stage has opened up and detail has raised quite alot.
Lee has used one in his cd94 and now in a cd17KI and seems very pleased with it.
I have used 2 clocks (I had 2 Audiocom clocks before) as I have two psus for the clocks and wanted to utilise these.
Brent
Ricardo
Sorry I have not got round to sorting a pro sch for the pre amp
Atc amp, there is not alot that can be done to it. The signal lines are all fully discrete and input caps are Clarity mmk + it has a 6 year warranty I'm sure i'll get itchy fingers though lol
The web site is designed for 17"+ screens
Brent
Sorry I have not got round to sorting a pro sch for the pre amp
Atc amp, there is not alot that can be done to it. The signal lines are all fully discrete and input caps are Clarity mmk + it has a 6 year warranty
I'm sure i'll get itchy fingers though lolThe web site is designed for 17"+ screens
Brent
Hi Ray.
I've tried Brent's new C2 in a few players now. I've back to back tested against an Audiocom Superclock4, Superclock2 (plus a combination of these in a cd63), and also Brent's own C1 clock.
I have to say it sounds incredible, better even than the combination of the two Superclock's in the CD63! As Brent said, the soundstaging and detail are in another league compared to the other clocks. Another really big difference is the increased dynamics it brings. I now enjoy a really fluid and cohesive sound from my cd17.
Oh, I used a DOS for the output from the TDA1547 and it's working brilliantly. It's done the I/V too! All I had to to is adjust the emitter resistors to lower the gain. I'll post a pic when I've tidied it up a little more and fitted the Supreme output caps.
Cheers, Lee.
I've tried Brent's new C2 in a few players now. I've back to back tested against an Audiocom Superclock4, Superclock2 (plus a combination of these in a cd63), and also Brent's own C1 clock.
I have to say it sounds incredible, better even than the combination of the two Superclock's in the CD63! As Brent said, the soundstaging and detail are in another league compared to the other clocks. Another really big difference is the increased dynamics it brings. I now enjoy a really fluid and cohesive sound from my cd17.
Oh, I used a DOS for the output from the TDA1547 and it's working brilliantly. It's done the I/V too! All I had to to is adjust the emitter resistors to lower the gain. I'll post a pic when I've tidied it up a little more and fitted the Supreme output caps.
Cheers, Lee.
Brent,
OK on your new clock, but would you like to try something rather different - our new TerraFirma Clock - for comparison?
http://www.vacuumstate.com/fileupload/NewsletterFeb_2009_1.pdf
Happy to lend you one for trials.
Regards, Allen (Vacuum State)
OK on your new clock, but would you like to try something rather different - our new TerraFirma Clock - for comparison?
http://www.vacuumstate.com/fileupload/NewsletterFeb_2009_1.pdf
Happy to lend you one for trials.
Regards, Allen (Vacuum State)
Love the name
I currently have both C2 clocks running on 2X PSU2. And I see your uber clock has plenty of psu and capacitance which is always good.
I've not run an external clock before and it is something I have thought of. What are the draw backs with the distance the clock signal has to travel.
Brent
I currently have both C2 clocks running on 2X PSU2. And I see your uber clock has plenty of psu and capacitance which is always good.
I've not run an external clock before and it is something I have thought of. What are the draw backs with the distance the clock signal has to travel.
Brent
rowemeister said:
That's great. Seems the commercial stuff isn't that great after all. But we already knew that 😀
Thomo said:
Wouldn't it be nice to line them all up, and do a jitter measurement on all of them? You can send them all to me if you like 😎.
Pic is great, i'd love to see that. You used a resistor for I/V?
Regards,
Ray
I think the Audiocom clocks are good just not £200+ good!! halving that price would be more realistic.
I have still to hear a player with the Ultra clock @ £400!!!
Brent
I have still to hear a player with the Ultra clock @ £400!!!
Brent
They work better than the original crystal, that's for sure, but that's not very hard 😀
What kind of oscillator do you use Brent?
Ray
What kind of oscillator do you use Brent?
Ray
It's a 3.3V GXO-7531 range @ 5ppm from Golledge in the UK.
I tested loads and found these offered the best performance.
Brent
I tested loads and found these offered the best performance.
Brent
Allen Wright said:
Allen
I just re read your post and relised you said you would lend the clock unit. I am of course interested in testing this product. It intrigues me.
Ray - when I get a larger stock of the C2 I will lend you one to test if you like.
Brent
rowemeister said:
That would be cool Brent, me like very much!
When I like it a lot, I will purchase it from you
. Next to listening to it, I will put it to the test at work if you don't mind, to extract some hard numbers 😀.Ray
Brent,
>>What are the draw backs with the distance the clock signal has to travel.<<
None, as the output of the clock is a correctly matched/terminated 75 ohm source, the connecting cable is a correct 75 ohm impedance coax, and it's terminated in the player with 75 ohms.
This makes it a ideal transmission line, with zero reflections and almost zero losses. The open circuit output signal level of the TerraFirma UberClock is twice as high as you would expect, as 50% is lost in the matching/terminating, so the required signal level appears at the end of the terminated coax inside your player.
But if you are nervous about that, I can also send you a TerraFirma "Lite" which is intended for internal mounting, and doesn't have the 75 ohm driving capability.
What frequency would you need, and what output signal voltage?
Regards, Allen
www.vacuumstate.com
>>What are the draw backs with the distance the clock signal has to travel.<<
None, as the output of the clock is a correctly matched/terminated 75 ohm source, the connecting cable is a correct 75 ohm impedance coax, and it's terminated in the player with 75 ohms.
This makes it a ideal transmission line, with zero reflections and almost zero losses. The open circuit output signal level of the TerraFirma UberClock is twice as high as you would expect, as 50% is lost in the matching/terminating, so the required signal level appears at the end of the terminated coax inside your player.
But if you are nervous about that, I can also send you a TerraFirma "Lite" which is intended for internal mounting, and doesn't have the 75 ohm driving capability.
What frequency would you need, and what output signal voltage?
Regards, Allen
www.vacuumstate.com
Burson Audio discrete Dual opamp V2
So,
I ordered the Bursons Audio discrete Dual opamp V2 and a pair of LM4562NA from audioupgrades.co.uk now. I must test this OPs.
For the moment the LME49720 runs in my 63er.
I hope Mickies problems with this Bursons are eliminated? (see above)
Knows that someone? I have no mail address from Mickie.
Baraccuda
mickie said:...so i got some Burson op-amps and installed them in my 67 - and ran into trouble. My LT1085 / 1033 - regs are getting extremely hot now and even with small heatsinks i can barely touch them. The interior of the player gets also heated up ;; the only way to get the whole thing going is with the lid open....
Has anyone any idea what went wrong? Are these Bursons drawing that much current? They are getting pretty warm as well.
Sound is also pretty much disappointing, no match for the LME49720HA so far; the Bursons sound shut in, midrange kind of veiled, edgy treble, compressed dynamics. Help...help....
Best regards,
Mickie
So,
I ordered the Bursons Audio discrete Dual opamp V2 and a pair of LM4562NA from audioupgrades.co.uk now. I must test this OPs.
For the moment the LME49720 runs in my 63er.
I hope Mickies problems with this Bursons are eliminated? (see above)
Knows that someone? I have no mail address from Mickie.
Baraccuda
It could just be his system and personal preference. The Bursons sound great to most people.
Simon
Simon
Indeed they do, those bursons are great! Something doesn't sound right if its cooking the regs! Is it oscillating out of control maybe? Are there any filter stages on the input?
I've just ordered another dual to sepereate and replace the BB604's (single on L & R ) in my Restek. They should be here tomorrow. 😉
I do however agree that those LME49720HA are bloody awesome for opamps. In my Restek, I have now replaced the BB2604's (3 of them) with these opamps (well 2 tin hats and 1 normal until some more arrive!). The soundstage and accuracy is unbelieveable. Decoupled with ZA's i'd almost describe the sound as too accurate! I've fitted them on sockets for testing but i'll solder them in when I fit the bursons to replace the singles tomorrow. I did some swapping about and the HA's are so, so detailed. I have to say that i'f prefer them all to be Burson but 1 step at a time, 4 Bursons in 1 go, I don't think so!
I also ordred a C2 for my other player. Everything I've heard so far leads me to believe it gonna be awesome. Although its obviously going into my other player, I'll report my findings back here as well!
Come on the postie!!!
Ian
I've just ordered another dual to sepereate and replace the BB604's (single on L & R ) in my Restek. They should be here tomorrow. 😉
I do however agree that those LME49720HA are bloody awesome for opamps. In my Restek, I have now replaced the BB2604's (3 of them) with these opamps (well 2 tin hats and 1 normal until some more arrive!). The soundstage and accuracy is unbelieveable. Decoupled with ZA's i'd almost describe the sound as too accurate! I've fitted them on sockets for testing but i'll solder them in when I fit the bursons to replace the singles tomorrow. I did some swapping about and the HA's are so, so detailed. I have to say that i'f prefer them all to be Burson but 1 step at a time, 4 Bursons in 1 go, I don't think so!
I also ordred a C2 for my other player. Everything I've heard so far leads me to believe it gonna be awesome. Although its obviously going into my other player, I'll report my findings back here as well!
Come on the postie!!!
Ian