Koetsu Blue Lace Onyx vs. Coralstone

@terry9 
Very curious about experiences with Koetsu and a silver Lundahl SUT, as I'm eyeing those options right now. Do you have the amorphous core LL1931/1941Ag or a LL1933/1943Ag?

I currently have a Bob's Devices Sky 40 and LL1931 (copper). With my Coralstone I find the amorphous core LL1931 to be much more detailed and transparent, which a much higher level of spatial information (really stunning). However, this comes at the cost of midbass punch, impact, and some of the organic warmth and musical flow the Coralstone is known for. So I was thinking of trying the LL1943Ag, which has a mu-metal core. But maybe the LL1931Ag is so good it addresses the flaws of the copper-wired version?

I find that the LL1931 pairs beautifully with a Shelter Harmony, btw (but the Coralstone is certainly the better cartridge). 

@mulveling

I have the LL1931Ag. I consulted the factory and they referred me to K&K, and after discussion, I took their recommendation. Very pleased.

Haven’t noticed any diminution of mid bass punch or impact. Some loss of sweetness, yes, I think so - but I recovered that, and more, by precisely torquing and aligning the cartridge. I concluded that the 31Ag was simply faithfully rendering the signal it was given.

Since you already have LL1931’s, you know that they don’t need anything but loading resistors and a box. That makes DIY SUT’s feasible for almost anyone, and makes the 1931Ag’s highly cost-effective. Speaking of loading resistors, I strongly recommend nude Vishay. To my ears, there is not even a competitor.

Good luck!

Thanks @terry9
My phono stage is a VAC Renaissance SE with the LL1931 built-in, and is chock-full of nude Vishays (I counted 36), including the loading slots. I’d previously borrowed a non-SE; the SE model’s Jupiter beeswax caps and nude Vishays make quite a positive difference. I figure I might as well go all-out to the Ag SUT at this point; agreed that the K&K prices are extremely reasonable! What loading value did you settle on for your Koetsu?

Loading is record dependent, to me. I like values between 30 and 500 ohms, but having said that, I'm probably going to change my tune when I finish my phono/pre V2.0 (which allows values 10 to 1500).

@mulveling 

Forgot to reference you. My phono should be finished in a few weeks (said that months ago!), should be able to give you a tighter range at that point.