Yes, I have the otherwise excellent Clearaudio Performance. With the Koetsu to an MC1000 tranny from Audio Innovations to the JD9 to a Classic 16.2 (300B) to Genesis VI.
I realized I didn't say what I modded on the Jolida JD9. I just made a new very worthwhile mod. I have modded it like I haven't seen anyone do yet. It is very, very quiet now. It has oodles of gain on MC, but at the expense of SQ. Using the tranny into MM is much more quiet and fluid. I can also use the tranny into a (modded) Yaqin MS22b. Same problem.
Now while I was writing I got an epiphany.... I had the grounding wire of the Koetsu on the Yaqin and the leads to the Jolida. Turnes out 'Ockhams Razor' proved itself once again. Or Murphy's Law. It was the most predictable and ubiquitous bad grounding. So check, check, check again. Funny how the groundloop only occurs when the needle is actually on
the record, that had me warped.
Ahhhhh problem solved.
So, to get back to the JD9 mods...
I made the 'low-out' a real low-out option that works much, much better and is a real
option. Under the motto 'less is more' it is now a tubeless 'low' option from the point straight behind the last opamp (without the 3.3uF output cap). I bypassed in total; the inputboard, 1 cap, 1 opamp, 1 big 5k R (substituted for a 680R +diff value filtercap), 1 cap, 1 big 10k R, 1 doubletriode and 1 outputcap. Now I can compare the new straight solid state tubeless low output with the regular tubed high output. And I can compare at the flick of a switch.
So what happened to the gain? Well, where I put my dac at volume 10 (full), I put the original JD9 on 3, after the mod 'minus 1 opamp' on 4 and the new straight output on 6. Leaving plenty of clean headroom.
But to come to the point: how does it sound? Really dead-quiet. No more tubeswoosh and static trickle. It sounds tight, controlled, focused, spacious. I can't say much yet about stage-depth and width. I need some more quiet listening for that. But it has a blacker backdrop. The overall frequency-curve is the same but it sounds more controlled. Tubes are nice if you can make a nice short signal path, but I don't need them as a gimmick 'tubey sauce'/ harmonic distortion.
The fun part is: I can now use the same output jacks as input jacks for my NOS dac so I can use the tubes outputstage as an extra gainstage. At the moment not at the same time (obviously). I'm still testing and since I don't want to drill some random extra holes I use the same jacks that were rather useless before.Edited by ]eep - 1/27/14 at 5:08pm