Hi, I have an ASR mini basis phono preamp. I have made some upgrades to other components with discrete opamps from different brands: Burson Audio, New classD, Sparcos ... and I have always liked them a lot. My intention was to use one of this type to improve the ones that the Mini Basis integrates. However, when requesting information from the manufacturer, it tells me:
The AD 797 is from input stage- has extremely low noise- there are only a few opamps that can be used
The AD 843 JN is for output stage- you ned an OPamp with adjustable output offset.
Only very few can be used.
The socalled “discrete built” opamps from Burson etc. can not be used in the Mini Basis. Have too high noise and to low gain.
Can someone provide me with information about an alternative model of better quality than the above mentioned opamps? It's a shame the door is closing on discreet opamps for this application. In my cd player, for example, the improvement was very big.
BR
Toni
The AD 797 is from input stage- has extremely low noise- there are only a few opamps that can be used
The AD 843 JN is for output stage- you ned an OPamp with adjustable output offset.
Only very few can be used.
The socalled “discrete built” opamps from Burson etc. can not be used in the Mini Basis. Have too high noise and to low gain.
Can someone provide me with information about an alternative model of better quality than the above mentioned opamps? It's a shame the door is closing on discreet opamps for this application. In my cd player, for example, the improvement was very big.
BR
Toni
The official upgrade (the Exclusive version) is made with AD843SQ, military grade of the original opamp. Having done an A/B testing with two indentical Mini Basis phonos side to side I can state that there is quite a difference.
Same conclusion when the upgrade was done (same phono, before-after)
The standard AD843 is sweet sounding while the SQ is more clean with more air.
The downside is that it costs a lot (50 euro/pc) and you need two but then again it brings your phono almost to Exclusive version status (especially if you also buy the accompanying power cable).
Same conclusion when the upgrade was done (same phono, before-after)
The standard AD843 is sweet sounding while the SQ is more clean with more air.
The downside is that it costs a lot (50 euro/pc) and you need two but then again it brings your phono almost to Exclusive version status (especially if you also buy the accompanying power cable).
Thank you very much for the reply. I understand that you could replace the Ad 843JN with the AD 843SQ. The sound improvement you mention is exactly what I am looking for and what offer, for example the Burson Audio Vivid 6 models (but what does ASR advise against) And the AD 797? This change would not be very important?
interestingly, at this link an owner of an MKIII uses discrete opamps with, he says, very good results.
ASR Mini Basis Mk3 Phono Stage
ASR Mini Basis Mk3 Phono Stage
Opamp rolling could be applied in every position. To me AD797 has already good specs and reputation, on the other hand AD843 is very special and I don't know if Sonic Imagery's solution is the appropriate. Of course the end result is all that matters especially if you plan on keeping the phono,
Mind that it could be that someone might like the stock one better, could find Sonic's or SQ version cold sounding.