OTL tube amp suggestions

Hello, I am in the market for a tube amp for my hd660s, I have 2 options now from the research I have done:

xduoo ta-26
feliks echo 2

I’m looking for alternatives and why I should choose one or the other.
Thanks!

The quality of the Feliks Audio Tube amp is much better than the XDUOO. That being said I haven’t listened to an Xduoo tube amp but from what I understand the ta-26 is basically a dark voice. I have owned and regret selling my echo 2. With the right headphones, it is amazing for the price.

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I own a Senn 650 and my amp that I use exclusively with the Senn is my Feliks echo (Mk1?) tube swap aside it does something special to the Senn that is quite addicting for that headphone. Just my 3 cents.

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You may also want to take a look at WA-2. I seen a few people on this community having one. One part that I like about Woo Audio is that you can get upgrade tubes from them and you know are good quality tubes.

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