Just Finished 10 x Gain Block One pre-amplifiers for one of our German OEM customers. Check out the SNR of these preamp modules measured at a gain of two over a 20hz - 20khz bandwidth. The noise even at higher gain settings only shifts less than 0.5dB. Signal to Noise Ratio of the Gain Block One is typically over -124dB Un-Weighted @ a THD+N of 0.00052%. Not a bad result!  

See Link below. www.stereo.net.au/forums/topic/285144-a-holton-experience/      

The opening to the Paris HiFi Show😀   On the Menu in Paris, Totaldac d1 twelve mk2, Driver, NAS and Server, Camerton Binom-1 speaker and Holton Audio Inviso true class A amplifier (world premiere) jointly developed with Holton Audio Switzerland   Holton Audio True Class A Dual Mono Bloc 50W/PC 8 Ohm 100 W/PC 4 Ohm, 0.003% THD+N -120dB SNR, 2.5KVA power supply, Fully Balanced 2 stage MOSFET cascode topology, 300,000uf total output stage filtering with dual mono bloc active input/driver stage electronic regulation, just to name a few of its features.