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output transformer less, supposedly the cost is lower than amps with output transformers
So is it better quality?Does it affect the sound?
OTL amp use output capacitors instead of output transformers (for impedance matching).
As for sound quality, the capacitor and transformer both will affect the sound, but whether it is good or bad really depends on the circuit design.
suitable to pair up with the hd6xx?
I don't have hd6xx or hd650, but many people are happy with DV336SE, and tube amps usually work well with high impedance headphones. Perhaps someone with hd650/hd6xx and DV336SE can answer your question, you may also visit head-fi.org, there are many discussion about hd6xx and dv336se.
Heck yes it's like they're made for each other.