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Old 5th June 2012, 08:47 AM   #11
SY is offline SY  United States
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Quote:
Originally Posted by kevinkr View Post
With inverting input grounded it is not a balanced input. If you want to use a balanced input configuration refer to the application note for input bias current path.
If the commercial circuit throws away the greatest advantage of the SSM2017 like that (balanced input with extremely high CMR), I'm not surprised that you weren't impressed. I'm using a similar circuit, though fully balanced and with THAT1646 as the output IC, for a temporary preamp while I debug my tube MM stage, and it sounds pretty darn good. NB that all wiring between arm and preamp is also balanced.
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Old 5th June 2012, 04:52 PM   #12
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OK. Thank you very much for your opinion. Josť.
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Old 5th June 2012, 05:03 PM   #13
kevinkr is offline kevinkr  United States
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Originally Posted by SY View Post
If the commercial circuit throws away the greatest advantage of the SSM2017 like that (balanced input with extremely high CMR), I'm not surprised that you weren't impressed. I'm using a similar circuit, though fully balanced and with THAT1646 as the output IC, for a temporary preamp while I debug my tube MM stage, and it sounds pretty darn good. NB that all wiring between arm and preamp is also balanced.
I don't think that is the only issue with this design, but I can see why they would throw away the diff input option since very few arms support the option.

Interestingly enough I can very easily convert my SME arm, all I would have to do is change the lead out cable at the proprietary connector. Unfortunately this is not an option on the much better Schick arm I use day to day..
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Old 5th June 2012, 05:23 PM   #14
SY is offline SY  United States
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What else do you think is not right about the design? Output cap is sorta puny, but the rest looks pretty straightforward.
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