I upgraded my speakers to B&W 803 D3’s and was looking to improve my AMP and fix a dirty input selector without buying a new expensive AMP.
I gave John my M3 AMP and he performed his stage 2 upgrade. It was well worth the upgrade and price was very reasonable for the work carried out.
It sounded much better, improved the control, bass and overall performance.
John also provided some advice for upgrading other components of my system and I bought a iFi SPDIFF which also improved my digital source buffering.
John is a highly experienced electronics and audio engineer. I would recommend JS Audio for repairs, upgrades and advice.