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Musical Fidelity A300CR Power Amp Stage 2 Upgrade

Jun 19, 2021 by Anonymous
Item Repaired/upgraded: Musical Fidelity A300cr Power Amplifier 

In-short I am very impressed and completely satisfied with the difference the upgrade has made. John has simply worked wonders. The depth, detail and base especially, have improved significantly, to the point that familiar tracks physically made me glow and smile


Musical Fidelity A5 Amp. A5 cd player

May 31, 2021 by Anonymous
Item Repaired/upgraded: Upgraded 

I upgraded my Musical Fidelity A5 integrated and A5 cd player! First and foremost, to say that John is a genius is an understatement. He knows what he does and is an expert at it. I have been an audiophile for 36 odd years. During this period, I have had loads of gear as it is with most audiophiles.
I cannot name all the various brands I have had during this period, I have always wanted better and never knew when to stop, Long story short, somehow trying to explore the next level of my unending passion and hobby I came across JS Audio, it took me a couple of months before contacting John and was very surprised by his level of audio knowledge and understanding, the thing that struck me most was that he was not selling a product or service but genuinely looking to help you achieve the best you are looking for in your hifi journey.
I had hours of telephone conversations with him and finally decided to upgrade my Musical fidelity A5 integrated, it took sometime for it to arrive back due to Covid 19. When I received the Amp, a few things were very evident, the noise floor was amazingly quiet, the dynamics and soundstage are wider, vocals and voices have amazing clarity like never before, instruments sounded real and live-like but I have to be honest, I still wanted more, I changed speakers, cables, interconnects and powercords.
I called John and he explained to me that I just have to allow the components to settle in with time, I decided to send my A5 cd player for an upgrade as well and when I received the CD player back and plugged it in, wow, suddenly everything changed, I cannot describe it but its just only a few days that I got the cd player back but I thought I write this review now. Maybe after one month I will have to write another review. I had a stage 2 upgrade on the Amp and a stage 1 on the CD player.
If all those hundreds of reviews won’t convince you for an upgrade just give it a try and you will be pleasantly surprised. I have to also say that John is a very nice gentleman as well, I travelled a long way to meet up with him personally.
John also gave me some advice and tips on speaker selection and that also helped me a lot in my last speaker purchase. I am enjoying my music now and looking to send my old amp of the 90’s which I have cherished for many years for an upgrade soon. I don’t know what de does and how he does it but something is just simply right with what he does. The problem now is that I want to listen to all my over 1000 cd’s over again. Lastly, be warned that very good recordings will be excellent and poor recordings will be exposed sadly, that’s my experience as I go through my CD’s over again.


Mightily Impressive

May 14, 2021 by Anonymous
Item Repaired/upgraded: Musical Fidelity M6 PRE 

I’ve now had my Musical Fidelity M6 PRE amplifier for a week after a stage 2 upgrade carried out by Mr John Sampson. And I’m mightily impressed with the results. The sonic presentation is more cohesive – and better integrated – like a jigsaw with all the pieces in their rightful place.
In terms of details the bass is definitely tighter with a more rounded tone. Mids are a tad more forward with vocals better articulated – a delight for lovers of the human voice like myself. The changes to the highs are less obvious, more subtle but I can detect no harshness or tendency towards the brittle – always the bane of the top end.
All in all Mr Sampson’s work has really hit the spot. Don’t hesitate if you’re thinking of an upgrade to a bit of your kit – you’ll leave your treasured hi fi in the best of hands. I shall certainly be returning to him with my other Musical Fidelity pieces in the future.


M3 Nu Vista Amp

Apr 18, 2021 by Anonymous
Item Repaired/upgraded: Serviced 

Thanks John. The amp sounds so much better now. And I appreciate too your recommendation for the turntable and for upgrading the phono stage in preparation. Now enjoying all my old vinyl - puts CDs to shame.


Power Amplifier upgrade

Apr 13, 2021 by Anonymous
Item Repaired/upgraded: 550k Superchargers 

5 years ago John upgraded the capacitors in my amps to help them drive my Thiel 2.4 speakers, the improvement was amazing. John has recently completed the final stage upgrade by replacing the transformers and adding even more capacitors. The impact has been transformational. They sound so much more powerful, I have depths of bass I could not ever imaging from the Thiels and so much more detail. The amps, which also used to heat the room are now cold in operation so I assume are far more efficient. I can't recommend John's upgrade service highly enough.


JS Audio Repairs , USA 5.0 5.0 164 164 In-short I am very impressed and completely satisfied with the difference the upgrade has made. John has simply worked wonders. The depth, detail and base especially, have improved
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