R/E/P > Dan Lavry
"Discrete Sound from an IC Op-amp"
JGreenslade:
http://www.profusionplc.com/
What say you? Is this the breakthrough THAT claim it to be?
Regards,
Justin
Jim Williams:
More marketing hoopla to sell new semiconductors. They don't discuss MO resistors that are sonically poor compared to discretes. These parts sound ok, but the SSM2019 is sonically clearer with less hf hype. Most of the time the discrete opamps have far less open loop gain, higher THD, lower bandwidth and these "errors" are what most audio folks are enamored with. A great opamp coupled with very good discrete transistors can beat this chip sonically and on the Audio Precision. Not too hard to do. Put it all in an 8 pin dip and it's very hard to do.
This is more to do about cost/convenience than quality.
danlavry:
thermionic wrote on Thu, 07 September 2006 13:48
http://www.profusionplc.com/
What say you? Is this the breakthrough THAT claim it to be?
Regards,
Justin
The IC's at the web you mention have very little specification
You can find out more about THAT at their web, and the datasheets are complete and detailed, as should be.
http://www.thatcorp.com/datashts.html
My general impression is (based mostly on the data sheets but somewhat limited hands on experience with those IC's):
THAT has some nice IC's. They are one of the very few semiconductor houses that offers low noise voltage and noise current capabilities, as well as other features that are suitable for good audio work.
Regards
Dan Lavry
http://www.lavryengineering.com
Schallfeldnebel:
Has anyone familiar to the sound of the INA 217 done AB tests comparing the THATcorp 1512 with INA217 or SSM2017?
Erik Sikkema
Jim Williams:
Yes, one customer has the D.A.V. BG-1 preamp which uses a BurrBrown INA217. I installed a socket and the owner can play as he has all three of the top contenders at his disposal. He reported that the Burrbrown part is the poorest performer while the that1510 has a bit of top end hype and the AD SSM2019 is the most natural of the three. I didn't get a chance to deep test it with the Audio Precision but they do test more alike than not with simple THD+noise tests.
BTW, trench isolation has been around a long time, it's used on FET input opamps as the FET transistors need to be overlayed to the silicon substrate as the bipolar process won't do FET transistors. Look to the BurrBrown OPA627 for an example.
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