Hi Anthony  Thought I would let you know how your amp is going. Received the One Zero Zero Supreme and have been very happy with what I’m hearing, straight out of the box it sounded much much better than my 100w Rogue Hydra Pwr amp and 150W Consonance pwr amp, both of which get very good reviews, now after about 30 hours of use its sounding incredible. Soundstage which already was deep and wide has grown and also projects forward more now as well, Bass has more impact and depth,  also transparency and detail has increase dramatically. I have owned some very good amps over the years including Tom Evans SET amps,  Audio Aero Capitole and Stereo Knight monoblocks, I can comfortably say your amp not only competes with these great valve amps but in areas like bass and detail it surpasses them,  I’m sure as the amp gets more...

HPA-NXA50L I have built two mono blocks. Each has a 600 VA encapsulated transformer, a RCRC filter with 0,5 and 0,25 ohms resistors and 600.000uF electrolytic capacitors, inrush current limiter, a mains DC-filter and loudspeaker protection.  The  bias is adjusted to 2,85 A the heatsinks are about 50-51 degrees Celsius (125 F) when  warming up from about 22 degrees Celsius  is complete.  This should leave headroom for use even during a hot Danish summer. But a lot of cooling IS recommended and cooling can hardly be overdone. The sound is magnificent. No less. The soundstage is huge and very roomy, the tonal balance is very neutral. Details are abundant and very natural sounding.  They let you hear all the detail you could possibly wish for, in a way that sounds utterly right. The details are there, you can clearly hear them, yet they do not seem exaggerated, on the contrary,...

"I am just listening to a CD called Crystal Tears with Andreas Scholl, the countertenor. It sounds like we are having a private recital with him actually in the room. it matches perfectly with my Harbeth speakers.   I have had Anthony Holton’s Three Zero Zero amplifier for several weeks now and have already listened to a lot of music on it. It is the 200 watt version of the flagship five zero zero which he built for me. There is a special pleasure in that - that someone can build you a bespoke amplifier for a very reasonable cost.   The sound of the amplifier is something special. It is very pure, detailed but somehow magically human and warm as well. I have largely owned tube amplifiers over the years. For me Anthony’s amplifier sounds like an ideal blend of both solid state and tube amplification. Loads of power...