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.
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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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.
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 !
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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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 !
What resistors do you like?
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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