LJM - MX50 SE Audio amp Power Amplifier Board Dual channel 100W+100W HiFi Stero KIT DIY

I didn't use these because I built with the wrong flux, but this kit is top notch; this review is based on building these and listening to the other identical ones I purchased. All the caps are Japanese or Korean, not one is Chinese or has the word Chong on it. The boards are spectacular. You WILL need a heatsink. With no attenuation of the input signal I saw temps get as high as 145F on the big transistors. One of the 3 small ones gets to around 130F but you can't even feel it on the heatsink. With no sound at the input it is stunningly quiet. I thought they were broken the first time I turned them on because I couldn't hear anything. When I actually supplied a signal and they were doing something I was completely floored. I have been using them since I built the system in July for outdoor listening in my yard. More than enough power to hear it throughout. I typically only use it between 25% and 50% (on an active preamp doing about 3.5db gain to offset the losses) volume. It is clear up to 100% without distortion. I'm using a 200va toroidal with dual 28v, dual 12v and single 12v secondaries, a softstart module, an LJM linear dual unregulated PSU with speaker protection, a DLHifi digital input/bluetooth board with dual ess9038q2m, a Cirmech dual ne5532 pre-amp, these boards, and a KYYSLB steel 270x265x100 enclosure. All in under 2 bills before wire and extras.