For yrs. I rolled preamp coupling caps. Multicaps, Sonicap Platinums, Clarity MRs, Mundorf S//G/O, CuTf V-Cap. JFX Premium, Dueland Cast,
mostly .22s, never in bypass mode. I also rolled most of those, including Dueland Alexander's thru a pr. of Mig 6c33c monos. I've two systems, one up, one down, each w/3 10g runs to an isolated subpanel. The 3 down r on Isoclean gold outlets, the 3 up, Watt gate silvers.
One day while wondering what to do w/all the used caps I took a closer look inside a power conditioner. Some tiny little .01s from neutral to ground
were replaced by .22s & so the experiment began that lasted well over a yr.
The outlets in the conditioner, mine had 5 duplexes out, w/ two individual legs in, also effect the sound. I replaced several of the orange hospital grade outlets w/Oyaide R-0s. You'd have to hear the two side by side in a neutrally cabled system, but the R-0s definitely bring 'more' to the table, after a bit of break in.
For the longest time I couldn't figure out how to utilize the CuTf Vs. They
definitely brought something special no other cap did, but alone or matched w/other .22s in the conditioner they were 'relentless', not forgiving & ultimately unmusical. So I kept taking them out. In retrospect they seemed
'tight', almost 'driven', but to much so.
They really do take what seems like forever to break in, to loosen up When I first tried matching them up w/the 3.3uf S/G/O I was pretty shocked at how they seemed to bring out the best of each. That proportion seems about right. The 'disconnect' when matching two different cap types, was mostly absent. I say mostly, because I think the V-Caps still needed additional break in. Evan so, the combo was special. Music had robust drive plus the dimensionality & focus, something akin to what a Amprex Bugle Boy brings to the table in a nice preamp. Depth & width, perhaps not the height.
That's pretty high praise. Those who've heard such & know their Mullards from their Amprex's, know the life & 'sparkle', the extended treble that leaves ones ears 'hungary', that bit of 'special dimensionality' that is difficult to find. Mullard in comparison r your favorite comfy slippers. Easy to wear, friendly, but perhaps a bit mishapen.
I run that conditioner mostly feeding a Yamaha A-S2000. CDS-2000. & Kef LS-50s. A very transparent, neutral, & spacious combination. When I do swap in another amp/pre/spkr or frontend, the basic character remains.
One other note or subject I'd like to address. After playing w/this combo I'd take issue w/those who claim, say the Kef LS-50 is only a 'near field' speaker. Clean power & conditioning make any speaker much more effective in filling a room. These little guys go plenty low @ good volume levels. They have coherency & dynamics & show any & all upstream changes, especially cables, ect... If it is warm it is warm, if it is rounded it is rounded. You will hear exactly what your 59' Valvo rectifier, your 6sn7 metal base, or your favorite silver speaker wire brings to the table, & you may be surprised! Can you handle the truth? I ended up stripping out many of the 'tweaks' accumulated over the years, including larger speakers.
In my room, effective passive conditioning went a long ways to bringing truth & beauty, (CuTf V-Cap & Mundorf Silver/Gold/Oil) 2gether.