[sdiy] Coolaudio VCAs: V2162 noisier than V2164?

[Chris Juried]

Hi Mattias,
What instrument(s) are you using for you SNR measurements? 
 Sincerely,   
  Chris Juried  
Audio Engineering Society (AES) Member  
InfoComm-Recognized AV Technologist
http://www.JuriedEngineering.com (Juried Engineering, LLC.)
http://www.TubeEquipment.com (Tube Equipment Corporation)
http://www.HistoryOfRecording.com (History of Recording)
 


      From: Mattias Rickardsson <mr at analogue.org>
 To: synthdiy diy <synth-diy at dropmix.xs4all.nl> 
 Sent: Monday, December 21, 2015 10:21 AM
 Subject: [sdiy] Coolaudio VCAs: V2162 noisier than V2164?
   
Hi there VCA lovers,

I've done some measurements of SNR & THD of the 2164 and 2162 VCA ICs
from Coolaudio, and I'm very surprised with the noise results I'm
getting. With the 2162 I cannot reach a SNR over 95 dB before
clipping, at any gain. With the 2164 at gain=1 I reach 120 dB SNR.
That's a huge difference!

When trimmed properly the 2162 does have slightly better THD, but the
noise seems to always be there in the background. I hope my
measurements are correct... the "-97 dBV" noise spec in the V2164
datasheet seems a bit odd to me compared to the "-94 dBu" in the V2164
dataheet - or I've misunderstood them.

Has anyone else tried the 2162 (either from THAT or from Coolaudio)
and compared it to the 2164 or other VCAs?

/mr
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