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MUSE Model 300 repair & upgrade

Jan 25, 2021 by Anonymous
Item Repaired/upgraded: MUSE Electronics Model 300 mono block amplifiers 

So glad I found John who was able to advise on repair and upgrade options for these old amps, they've been repaired twice before so I wanted to make sure they stand the test of time. Decided to go the whole hog which entailed:
- upgrading the toroidal transformers from 500VA to 1000VA (custom built and main cause for the delay)
- upgrading the smoothing caps from 4x10,000uF to 4x22,000uF in each amp
- upgraded the MOSEFETs to higher voltage modern Profusion devices ECF10N/P20s (6 pairs each amp)
- new binding posts, internal cabling replaced and sorted.

After many months with work delayed due to COVID impact on suppliers, they're back home. Its clear there is a LOT more dynamic range, lower noise floor, more details coming through, timbre of drums is richer etc. And the bass - I've never heard bass so deep and controlled before on my system. The overall signature from my ATC SCM40s is anything but lean - the amps now really show what these speakers can do and I expect they would drive the bigger SCM50s well. The original character of the amps (or lack therefore) is retained but with a lot more of everything.
While not cheap, the cost has been a great investment and I hope these amps will last many years to come, I am thoroughly enjoying them.
Thank you John!

P150 Repair and Upgrade

Jan 05, 2021 by Anonymous
Item Repaired/upgraded: Musical Fidelity P150 power amp 

I’ve deliberately delayed submitting this review to let the amp settle down and bed in but I’m very impressed. The control and clarity that the amp now has would cost an awful lot of money if buying new but this is achieved without sounding clinical just smooth authoritative powerful sound it’s an addictive mix. I’m now scouting the second hand market for another P150 and if I find one it’s going straight to John for him to work his magic.

KW 250s

Jan 04, 2021 by Anonymous
Item Repaired/upgraded: Upgrade 

Now that I have had time to listen properly and to after a lot of tinkering with my system finally got to a place I am happy with I feel able to review John's work.
The first most obvious difference was that the sound seemed airier. More space around the notes and instruments, generally more clarity was evident and this has continued to improve as it runs in. Leading edges of notes are now so finely etched, so clear that it is quite astonishing.
Bass weight has also increased markedly. On certain pieces the whole room moves, you feel the depth, subterranean depth but not at the expense of clarity and definition.
Low level listening is remarkable in that clarity and space- up, down, left, right, beyond the speakers- is now tangible but not in a regular 'hifi' way but rather it just sounds like music.
I had considered getting a phono preamp as the gain from the originally spec was insufficient for a relatively low output MC cartridge. However this is no longer a problem- quite what John did I have no idea but the difference is considerable.
Of course I now know what people mean by bad recordings such is the transparency of this system but that is a price I am prepared to pay.
Finally to say that my speakers are by no means inefficient and could play happily with a valve amp however the MF now commands them with an iron fist and the result is spectacular.
A great service and remarkable result. I am a very happy customer!


Dec 31, 2020 by Anonymous
Item Repaired/upgraded: Testing123 

This is a test and it will be deleted.

Musical Fidelity NuVista 800 Upgrade

Dec 21, 2020 by Anonymous
Item Repaired/upgraded: Musical Fidelity NuVista 800 

John recently carried out a stage two upgrade on my Musical Fidelity NuVista 800 Amp. His work transformed what was already a good amplifier into an excellent one that has sound quality of a much higher level of quality. The soundstage is precise, realistic and has excellent composure making listening to music even more of a pleasure. Thoroughly recommended.

JS Audio Repairs , USA 5.0 5.0 155 155 So glad I found John who was able to advise on repair and upgrade options for these old amps, they've been repaired twice before so I wanted to make sure they stand the test of tim