DIY do it yourself tube amp kit


Does anyone know of a really high end DIY tube amp company?
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I want to build a pair of Mono Block tube amps. I have a pair of ML Quest Z. What is your recommendation? I play my music loud and listen to all kinds of music. What do you think?
Are OTL's good with low impedence electrostats?

At the crossover region of 125Hz, I think those speakers were known to drop down into the 2-3 ohm range. Not an easy load, at all.