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... and it is absolutely stellar with my Beyer DT990 - 600 Ohms. Chrystal clear, with lots of punch, sparkle, and air.
I'm really sorry to hear about Mad Dude's numerous problems with the CSP2+.
I've also had my fair share of similar problems with another tube amp manufacturer (not Decware), but that is another story.
My transformers blew up and it was too costly (or rather not cost effective) to send my amp both ways overseas to get it repaired even though it had a one year warranty.
Suffice to say, there is always an element of risk involved for any tube amp purchase, especially when one purchases a tube amp from a country which is foreign to the buyer.
Another caveat for the CSP2+ would be that it can sound bad if you use the wrong combination of tubes.
For example, in my audio chain, the Valvo CCa has an over bloated bass when used in the CSP2+ (with a Tung Sol 5Y3GT rectifier).
(I'm sure that the Valvo CCa is still a wonderful sounding tube in other audio system though.)
However, with the
right combination of tubes, the CSP2+ is really State of the Art.
I have tube rolled many makes (e.g. Siemens CCas, Lorenz, Mullards, Telefunken, Philips, Russian 6N1Ps .... etc) of the ECC88/E88CC/7308 family of tubes with the CSP2+ and have finally settled on the following combination.
1. Rectifier - Tung Sol 5Y3GT (Thanks to Skylab over here for his 5Y3 rectifier recommendation)
2. L/R Drivers - Siemens Grey Shields E188CC
3. Input Tube - Amperex (US) Pinched Waist 6922 (Yes, Joe's Tube lore is correct. The PW is the "King" of the ECC88 family! IMHO, the Lorenz tubes would be "Queen"
Source : Oppo BDP-95
Cans: Beyer DT 880 - 600 Ohms
With this combination of tubes, jazz vocalists such as Ella Fitzgerald have a
living breathing presence when I listen to my headphones.
There is also sonic clarity, tonal and timbre accuracy, excellent instrument separation and soundstage, tight and impactful bass, "air" from wind instruments.... basically all the boxes in my audiophile checklist are ticked!
Yes, there are much better cans out there such as the Audeze LCD 2, LCD 3 and Stax Earspeakers and what not.
But what makes the CSP2+ truely exceptional is its ability to turn my humble pair of Beyer DT880 into a pair of "earspeakers" in my audio chain.
Kudos to Decware (and Steve Deckert), for my little piece of audio nirvana, I don't have to spend 5 grand for a pair of "earspeakers" nor do I have to spend 3 to 4 Grand for another SOTA headphone tube amp.