BURSON SINGLE AUDIO OPAMPS ! ONE OF THE GREATEST ! - Page 4

sgrossklass · 21st February 2012, 09:18 PM

In any case OPA627s are relatively fast opamps reputed to require some attention to layout. I don't think an integrator as used in a DC servo would be very likely to oscillate, but still it's something to consider.

Evaluating things solely by ear isn't what I'd call a particularly good idea. For one thing, measurements tend to be an awful lot more reproducible. Try picking up low-level oscillation by ear, too... performance is not necessarily degraded enough for it to become plainly audible.
By comparison, listening tests done right are a real PAIN. It still isn't a bad idea to conduct them if measurements look good, though at this point I wouldn't expect anything unusual any more provided you've measured the right things (interpreting measurements is a bit of an art by itself, but one worth learning).

Raj1 · 22nd February 2012, 05:58 AM

Yes that is true. I just don't think we'll reach a point where everyone has the equipment or knowledge to fulfil those requirements. Its one of those things where we have to let both camps be. It takes all sorts to make a community, some are here to learn while others only participate on a level that suits them.

vmed_cha_gr · 22nd February 2012, 06:36 AM

Raj1 · 22nd February 2012, 06:48 AM

Quote:

Originally Posted by vmed_cha_gr

Can't hear it. Might be more useful if you post up the waveforms so we can see what is going on.

vmed_cha_gr · 22nd February 2012, 06:48 AM

I have the early schematics of the amp. Audio signal passes through the opamp. Otherwise i wouldn't buy the Burson. Also upgrade kits sold for this amp include changing the opamp.

Quote:

Originally Posted by Quattor

Hmmm, I have seen the schematic of the Audiolab 8000P (to tell you the truth I do not know the serial number of it) and it uses bipolar transistors as the input diff. pair and one OP amplifier as the DC servo (TL071). From the pictures seen, this one can be one of the newer versions - possible 2SK389 as an input diff. pair. Do we realy know what is the use of the OP amplifier there? DC servo? Or something else? It would be funny if it is a DC servo. But, hey - if it makes you happy, why would we judge?! :-)

vmed_cha_gr · 22nd February 2012, 06:49 AM

hahaahhaaaa .... nice !!!

Quote:

Originally Posted by Raj1

Can't hear it. Might be more useful if you post up the waveforms so we can see what is going on.

soldering guy · 23rd February 2012, 09:02 PM

Actually a guy made some comparisons. Ic opamps vs the bursons..he even uploaded some tracks. Take a look.

Boscoe · 23rd February 2012, 09:56 PM

Did you hear any differences?

vmed_cha_gr · 24th February 2012, 05:49 AM

Since i shared my experience & had the luxury of direct comparison take a look here. You will get an idea of how good they are -->

Burson Audio Blog

And these are diyers that shared their projects, at least they were not attacked by extra terrestrials...

Paul S · 24th February 2012, 06:38 AM

I stumbled across this thread last night, read some of it, usual naysayers that don't know what they are talking about if you ask me..

I was tipped off by 2 fellow ASR users, that Burson single op amp replacement in the Emitter 2 exclusive was a definite upgrade, I read into it as I usually do. My E2 had the later OPA 551 ic's fitted, so my first thing was to try the Ad843 that ASR originally used, and employ various bypass caps across 1&7. There were slight improvements, nothing major, but worth the time and little cost. I did then order the Bursons, and fitted them on the day of arrival, together with a .1uf Vishay Roderstein across 1&7. Yes, again a small improvement, but I had to let them settle for 100 hrs minimum. So, left system on for a week, then tried again.

To all of those that have not done the above, you are not in any position to debate on the benefit these Op amps provide. Looking at data tells us absolutely nothing I'm afraid, as much as I'd like these to 'test' better, they are average at best on paper. Which is fine if all you guys want to do is study specs, I personally would much rather listen to Music that is startlingly realistic at home, and that is helped no end by using the Burson Op amps.

And before anyone goes on about this dbx testing, you don't need to to hear the difference. Placebo? Give me a break, I don't give a s**t what option sounds better, as I have no affiliation to any if them. Would I swap them back to ic's? Er no, no way. Anyone want some ic's, I have some for sale.

23rd February 2012, 09:56 PM	#38
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Did you hear any differences? __________________ I thought about it once, but then thought again.

24th February 2012, 05:49 AM	#39
vmed_cha_gr diyAudio Member Join Date: Jun 2009	take a look Since i shared my experience & had the luxury of direct comparison take a look here. You will get an idea of how good they are --> Burson Audio Blog And these are diyers that shared their projects, at least they were not attacked by extra terrestrials...

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21st February 2012, 09:18 PM	#31
sgrossklass diyAudio Member Join Date: Nov 2004 Location: Germany	In any case OPA627s are relatively fast opamps reputed to require some attention to layout. I don't think an integrator as used in a DC servo would be very likely to oscillate, but still it's something to consider. Evaluating things solely by ear isn't what I'd call a particularly good idea. For one thing, measurements tend to be an awful lot more reproducible. Try picking up low-level oscillation by ear, too... performance is not necessarily degraded enough for it to become plainly audible. By comparison, listening tests done right are a real PAIN. It still isn't a bad idea to conduct them if measurements look good, though at this point I wouldn't expect anything unusual any more provided you've measured the right things (interpreting measurements is a bit of an art by itself, but one worth learning).

22nd February 2012, 05:58 AM	#32
Raj1 diyAudio Member Join Date: Jan 2003 Location: UK	Yes that is true. I just don't think we'll reach a point where everyone has the equipment or knowledge to fulfil those requirements. Its one of those things where we have to let both camps be. It takes all sorts to make a community, some are here to learn while others only participate on a level that suits them.

22nd February 2012, 06:36 AM	#33
vmed_cha_gr diyAudio Member Join Date: Jun 2009

23rd February 2012, 09:02 PM	#37
soldering guy diyAudio Member Join Date: Sep 2010	Actually a guy made some comparisons. Ic opamps vs the bursons..he even uploaded some tracks. Take a look.

24th February 2012, 06:38 AM	#40
Paul S diyAudio Member Join Date: Oct 2011 Location: UK	I stumbled across this thread last night, read some of it, usual naysayers that don't know what they are talking about if you ask me.. I was tipped off by 2 fellow ASR users, that Burson single op amp replacement in the Emitter 2 exclusive was a definite upgrade, I read into it as I usually do. My E2 had the later OPA 551 ic's fitted, so my first thing was to try the Ad843 that ASR originally used, and employ various bypass caps across 1&7. There were slight improvements, nothing major, but worth the time and little cost. I did then order the Bursons, and fitted them on the day of arrival, together with a .1uf Vishay Roderstein across 1&7. Yes, again a small improvement, but I had to let them settle for 100 hrs minimum. So, left system on for a week, then tried again. To all of those that have not done the above, you are not in any position to debate on the benefit these Op amps provide. Looking at data tells us absolutely nothing I'm afraid, as much as I'd like these to 'test' better, they are average at best on paper. Which is fine if all you guys want to do is study specs, I personally would much rather listen to Music that is startlingly realistic at home, and that is helped no end by using the Burson Op amps. And before anyone goes on about this dbx testing, you don't need to to hear the difference. Placebo? Give me a break, I don't give a s**t what option sounds better, as I have no affiliation to any if them. Would I swap them back to ic's? Er no, no way. Anyone want some ic's, I have some for sale.