I have had many discussions with James at Whest about how to elevate performance in the analog chain. He always told me that as great as the AT20ss is and it is one of his all time favorites, any MM cannot pull out the detail from the recording as well as a good MC. It has to do with the mass and reaction time the MM has which makes it slower than a well designed MC. The MC will simply open things up and really dig out the detail. I have also heard from others that a MC cannot duplicate the huge low end dynamic output of the AT20ss.
Since I now have a custom built PS.30 RDT SE 2019 with an input side trimmed for 20 pf so that my total input capacitance will hit 150 pf, the perfect specified capacitance of the AT20ss. And a modified gain setting for 46 db which is what works so well with the 20ss; I have the best available for playback with one of the finest MM ever made. The new dialed in capacitance did shift the high frequency peak up and out of the listening area which super smoothed out the entire range of the AT20ss; it has never sounded so good!
James hit it right on the mark; he knew exactly what to do and I suspect that is because he owns the AT20ss and has used it with his development work.
With all this being said; he still pushed me to consider a nice MC; he thought that I'd enjoy the improvement over the excellent AT20ss. Since Whest uses the Ortofon Anna, A95 and A90 cartridges for their design testing, I thought it would be great if I could find one of these and I was lucky to stumble upon a mint condition A90 MC.
In an exchange with James not long ago, he told me that he prefers the A95 over the A90 in OEM stock configuration with the Replicant 100 stylus. However after retipping his A90 with the ES Paratrace stylus, he prefers the A90 over the A95.
Having listened to my new to me A90 with the Replicant 100 stylus, I have to say that it does surpass the AT20ss in all aspects, including the lower end dynamic output which surprised me. I have two copies of Eric Burdon 'Declares War' which dates back to around 1970. Both in near mint condition and both suffer from some surface noise (clicks pops) which I have always had to just ignore. When I put this record on with the A90 all and I mean ALL of the bothersome surface noise is gone! It was like I just picked up a brand new analog repress. After the first cut "Spill the Wine" which is a late 60's early 70's psychedelic play, it rolls into the balance of the front side which is all blues with a great Saxophone. The detail I am hearing now is simply astounding! I can hear the light breathes of the sax player and the low deep from the lungs low level breath as he fills the sax softly in the background as he joins Eric Burdon on quiet passages.
I was simply stunned at what I am hearing now. I decided to play with the loading after hearing this. I moved to 220 ohms vs. the suggested 100 ohm setting with the A90. It's interesting and I wish to play more on this setting as I am hearing more open air, but I want to see if I am missing anything after I go back to 100 ohms in a week or so.