Got hold of a Linear PSU for the laptop. Zero-Zone L164-30, Ultra Low Noise. This does 'seem' to affect the perceptible audio sound. Not only does it sound sharper and clearer, but also seems to alter the 3D spaciality: makes wider & deeper but also tighter at the same time.
John Wood 6L6 Valve Amp, with:
6L6GC Russian Original (no logo) Output Tubes 4x, supplied by J.Wood.
ECC81 Mullard NOS Input Tubes 2x
12AU7 (ECC82) Brimar NOS Input Tubes 2x
Wilson Benesch Actor Loudspeakers.
REL Stampede Subwoofer.
Cary Audio 100t Dac.
M2Tech Hi-Face 2 RCA USB to S/PDIF (co-axial) converter.
HP Pavilion G6 - 2382sa D0Y14EA#ABU + "The Teddy" 19/3 - 19V 3.5A LPSU.
The Missing Link Ultra-Pure System ~ EPS-100 ~Audiophile Silver Un-switched Double Wall Socket +
APC ‘SurgeArrest’ Surge protector - PM1W-UK (Schneider), + AG500P Power Inspired mains – ‘pure sine wave’ re-generator.