We have been working on this for the past two and a half years and it is finally finished. My tech wiz, Rhys Davies, built the whole unit himself and wired it. We had lot of changes along the way but it works GREAT and we got exactly what we wanted. S/N -95.5 dBM, Distortion .0005%, Frequency Response 20 t0 20 KHz +/- .5 dB. It is built in an old "industrial control unit" shell that we got from the surplus store. It is built using the  MTC board from here https://www.ka-electronics.com/shop/. I am very proud of Rhys, he is a junior at Ohio Northern University studying electronic engineering and has worked here for 4.5 years as an intern.