DarTzeel’s new direction

I’ve played with dartzeel’s amp circuitry, and assessed overall design.. they are trying to replicate tube sound, by increasing output impedance and create sophisticated fb loop freq./phase characteristics in SS ckt. I give Dartzeel credit of 50Ohm pre/amp interconnects design, which has sense to eliminate reflections and affecting sound resonances in longer than ~3ft cables. 

Few years ago I red Geneva Switzerland Audiophile direct Accuphase A70 comparison to DartZeel NHB.. Well, Dartzeel lost!. I confirmed in my experiments that replicating tube sound by SS ckt by Dartzeel has some disadvantages, and can be used only for flatter Z/freq. speakers, while Accuphase can drive speakers from 1Ohm to 16Ohms without affecting sound much.

@lynn_olson for ideal non reflective response cable characteristic impedance must match driver and receiver impedances.. we have to choices for coax 50/75Ohms. problem with RCA is a connecting low output impedance drivers (pre/phono/cd etc) to high (47kOhm/10pF) receiver, which generates reflections. Cable of 10ft or longer in such condition has sonic signature, such as harsh sound etc. matching source/cable/receiver impedance eliminates that.