Mundorf (non-oil) Silver / Gold EVO MCap Supreme coupling caps in your tube amp ???

Update on Consonance M800SE Monoblocks with ClarityCap MR's.
I have close to 100 hours on the ClarityCap's. I find them dead neutral. They don't add or subtract from the source material. I have updated the power supplies to schottky diodes, kiwame resistors & double the capacitance on the - bias. Also changed resistors to Mills 5 watt for the screen grids & cathode bias. Added diodes to screen grids. These mods made huge difference in detail, soundstage & clarity. Its like a veil has been lifted. Next I am going to try expensive Audio Note Tantalum resistors for the grid of the output tubes. These will replace Russian MLT 5% resistors. I hope they will be worth it.

That is exciting stuff hifijunky! I haven't tries the audio note resistors but really like the kiwame's. Please keep us updated on how it sounds. 

I installed Audio Note Tantalum non-magnetic new version resistors in my left Consonance M800SE Monoblock. I replaced all but two (value wasn't available). For those I used Takman Rey resistors. Total of about 15 resistors(30 total ouch on cost).The right Monoblock still has the original Russian Metal films. Great having monoblocks so you can compare. Checked volume with sound level meter and found it was 1db lower on modified Monoblock than the right one (after every mod I've done the volume is alway lower). Adjusted level on Herron Preamp 1 click to equal.
Modified Amp sounded dull and lifeless at first. After about 15 hours much better. Warm and very detailed. Unmodified Monoblock is brighter, sounds like a transistor radio in comparison. Maybe that is too critical, I like the modified one better. Metal films are known for being bright. Now I'll have to put 6 hours into updating the right Monoblock.
Note there were 2 upgrade kits available for the the DIY Audio Ella amp (same design as the M800SE).
Level 1 was with Kiwame resistors. Level 2 was Audio Note Tantalum magnetic resistors. I am not sure what type of resistors were in the original non upgrade kit. Maybe the Russian MLT's. That is why I went for expensive Audio Note resistors. 
Anyone near Bergen County NJ and what to hear the difference let me know.

Thanks for the update hifijunky. Glad you're happy with it. 

3-years later, update #2. Second try at using these exact same Mundorf Supreme EVO Silver Gold caps in different amps. Great results, again. Yes, they are more expensive, and proving to be worth it in my systems.

Type/Part#:
Mundorf Capacitor 0.22uF 1000Vdc MCap® Supreme EVO SilverGold Black SESGUSD, SKU#: MUNDORF-80510
Note: these are not the oil cap.

Update:
Recently removed well known mainstream poly coupling caps and installed another two pairs of of these in a different pair of Mono Tube amps. Same amazing results as my former tube amps. Just proved it was not luck or a fluke last time around. These caps are truly very nice. Comparing to other Clarity, Jensen, Cardas, Multi-Cap, Orange Drop caps previously used. Kinda like VCap sound but with more texture, nicer tone, added musicality.

RESULTS:
-sounds natural. Piano, Guitar, Voices simply sound more authentic.
-added depth and transparency without any edge or grain at all (nice!)
-guitars strings definitely glisten and there is some added delicacy...
-lower level micro detail comes through yet not overly detailed.
-smooth on top, great midrange, nice tone, beautiful texture is there!
-added layering, intriguing 3rd order harmonics coming through.
-great separation for each instrument, no blurring, separation is neat.
-added decay and air around various notes and instruments.
-added clarity with low volume listening.

Your Results May Vary. Like getting an amp and speaker upgrade in my case. You’ll see these exact caps being used in ultra-high end amps too.

Unexplained:
These (3 years newer version) started forming and sounding good only after 5-8 hours burn in time this go around.  Not sure why, last time it seemed like to took a long time for caps to settle in 30-45 days, and more changes again after 60 days.  Not changing as much this time early on. Will see.  Will report back if the burn-in changes again over next month. 

Issue:
-Waited too long to try them again in my new amps.
-Expensive, but proving to be worth it vs. other upgrades.
-Only way to know is to try them yourself. Not much on internet.

...hope this helps someone. Back to listening.