Coincident Frankenstein mk.2 amps

tswista, 
Congratulations on acquiring the Frankenstein mono blocks. I'm happy to read that they're sounding "wonderful " in your system. I suspect the pairing with your incoming Zu Soul Supremes will be a genuine example of music listening bliss.
Charles 

The Supremes are arriving today.  I wanted to add to my previous post as I was rushing and merely wanted to give an update.  As wonderful as the Dynamo was, the Franks are a huge upgrade.  What stands out the most is the perceived power, but the soundstage is enormous and all the instruments have more weight.  Dynamics are simply amazing.  Stop/starts in music are incredibly sharp and crisp.  Everything comes from a silent, dead black background.  Goosebumps are a regular occurrence.  I wanted to ask if there was a consensus on tubes.  What 300bs and rectifiers are being used?  I had a suggestion for Black Bottle Psvanes from Mr. Blume as well as a Mullard CV 378 rectifier.  I'd love to hear what everyone is using.  Thank you.

I copied @charles1dad and got the Mullard's and eml xls 300bs. Loved that combination. 

tswista,
The following tubes I’ve used and are superb in my Frankensteins.
Elrog, Takatsuki, KR XLS and EML XLS. In terms of sound quality you can’t go wrong with any of them. I’ve settled on the EML XLS. Absolutely reliable, very rugged workhorse type of tube with dynamic and authoritative yet very natural presentation.

As cal says I’m using the Mullard rectifier x the past 4 or 5 years. Excellent sound and no reliability issues.

Do you have any early listening impressions of the Frankenstein and Zu Soul Supremes formed yet?
Charles

@charles1dad Thank you.  In addition to what I described above, I can say that I never thought I could achieve this level of detail, drive, realism.  The sound is incredibly engaging, more so now than ever.  

The Mullard you are using is the CV378?  Mr. Blume wrote in the manual not to try tubes other than the 5u4gb, but he suggested the CV378, so I am a bit confused.  I have also read that the KR tubes were somewhat unreliable.  

The Supremes are amazing.  The DWs could get a bit etched or strained at times.  The Supremes are smooth on the highs, relaxed but extremely detailed.  The sound is fuller and it I feel it is more coherent from top to bottom.  Placement is very important.

What is my goal with replacing the tubes?  I really don't know, but I am always looking to improve the sound.  Being surprised by some new sound is something I enjoy immensely.