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...

In the recent months, I have put together my power amp based on Holton’s DIY kits. I choose the HPA-NXL300 R4. I run a straightforward 2-way loudspeaker system based on SEAS drivers. These loudspeakers are really good in terms of sound stage (the DXT tweeter is very nice) and the phase-coherence. The latter is where the magic happens (at least for me) for any loudspeaker. I was looking to upgrade my Class-D based amp that sounded very clean, but missed the music, its missed the magic. Building the kit was a lot of fun and with a bit of help from Anthony, very achievable. I ordered transformers from Poland and a DIY chassis from Italy. I used the HPA-NXVPSU-One R2 Power Supply to power the module. When I turned on the AMP, it immediately put a smile on my face. It was clear immediately that this amp has all the...