Well, I don't have the Burson schematic, but looking at the audio-gd "Earth" one, I can see room for improvement. For example, they could use the LSK389 instead of the discrete K170's for the input differential pair. There's also no current mirror to be found.
The Sonic Imagery Labs op amp uses monolithic NPN and PNP matched pairs for the input differential amplifier. That's just one example. However, of course, this op amp requires it's own special socket. It's not a DIP replacement like the others.
Ok but selected 170 is better than the 389 and the 389 is out off production. If anybody is interested I have more than 20 of the 389 GR.
Sorry LSK 389 is a new version of the 389 ?
Sorry LSK 389 is a new version of the 389 ?
The Sonic Imagery modules have very impressive specs, much better than the Burson. I'm afraid to ask the price...
Would be nice to know what kind of resistors is used inside the Sonics opamps. Specifications is not enough to make me buy !
Oh, you can call them up. They should be open right now. I'd be surprised if they use anything less than 1% metal films. I was looking for a photo of the guts somewhere but I can't find it. I'm familiar with the monolithic transistors they are probably using, from Analog Devices:
MAT01 | Matched Monolithic Dual Transistor | Matched Transistors | Special Linear Functions | Analog Devices
I'm just guessing though.
Ah, I think this is it:
http://www.ebay.com/itm/Matched-PAI...ltDomain_0&hash=item415e519871#ht_1393wt_1202
Well, this is Five Fish, which is not the same thing, but they are probably so close that it doesn't matter.
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It would be fun to try to design one of these pro audio type discrete op amps that is better than what anyone else offers. The PCB is only about 1" square. We can do better than these guys.
No,
It seems they used to make them for Burson and now sell them on their own. However there are differences between what Burson sells now and what AG is selling. There are some significant parts differences, even size changes and performance differences.
🙂 Go ahead ! 😉
Have you seen THAT 340 and other product from That ?
I am trying to make a I/V stage with THAT 340 at the moment .
Anyway I do not like metalfilm resistors !
It would be difficult because they are use different sockets.
I think products like the Burson are just for those who want a discrete op amp in their existing commercial gear that uses DIP chip op amps. I would not use one for a new design.
Oh, those THAT 340's look really nice... thanks for the suggestion. Oh! and they are available in DIP package! Me likeee!!
What is your favorite resistor then? I doubt I could hear the difference myself.
Unfortunately, I lack the skills to make such a PCB myself, and I have very little design experience also.
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Well I choose the resistors by listening to the product to modify. What kind of coloration do I want.
I think the most neutral is Takman Carbon type.
Off course you could hear the differencses on a Setup wich was good enough !
I think the most neutral is Takman Carbon type.
Off course you could hear the differencses on a Setup wich was good enough !
http://octopart.com/that340p14-u-that+corporation-11757522
http://uk.farnell.com/that-corporation/that340p14-u/transistor-array-dip14-340/dp/1354180
http://www.profusionplc.com/pro/gex/pcatdtl0?ipartno=THAT340P14-U
They would have to be MANUFACTURED in EU in order to avoid customs import taxes. A dealer would have to pay those taxes too and add them to the final price...
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Why do you need to know? Surely you can tell just by listening with your experienced golden ears? 😀
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