Yaqin tube amps: any further thoughts?

[Feanor]

I'm friends with a guy who deals in audio and he allows me to take his tube gear home for extended periods. In my house I've listened to Fisher 400, 500's, Citations, Dynaco ST70, HH Scotts, Pilots, HK Copper Top, Jolidas and most recently a Prima Luna Prologue. These are all push pull tube amps in excellent condition and if I had never experienced a SET I could have been happy with any of them.

That's at odds with RGA who's saying tube amps are all over graph for sound quality, so what to belief.

Probably what I'd most like to try, apart from the price being a little high for me at the moment, is a pair of Triode Dynaco Mk3's ...