Wildcatsare1
Headphoneus Supremus
That's interesting to hear. Do you think I would get impressed going from an Essence STX to a Schiit tube amp? Do you feel like the "improvements" in coloring and detail are significant?
To be honest, I am too new to "Head Fi" to really give meaningful advice, I am still learning.
What I do feel comfortable talking about is the fantastic synergy between the Valhalla and the 650's. My past experience with OTL Amps was with Electrostatic Speakers, a similar synergy. In a bit different way, I am not an engineer, health care, so assistance/correction of my attempt at explanation is appreciated. I believe OTL Amps have a synergy with higher resistant loads, with my older SoundLabs the resistance is higher on the low end, so simply said OTL's provide greater control, with the 650's specifically, I don't have direct experience with others or know enough about Head Fi to recommend existing threads/posts (again feel free to jump in experienced Head Fi'rs), but the 300 ohm load of the 650's has a synergy with OTL's, though IMO, across the sound spectrum, from low/mid/high, tighter bass, clearer midrange, better quality highs, the Valhalla opens up the sound of the 650's in my limited experience, this combination sounds wonderful.
I guess a long winded reply to say yes, give the Valhalla, Valhalla 2's a listen with your 650's, I believe you will love them.