Hi, installed the upgrade and it immediately provides more serenity to the sound. Great improvement.

Sophisticated module! Recommendation! Well manufactured! Thanks!

Das Modul ist absolute Spitzenklasse

Now that I have been listening over the last week, I have noticed an astonishing improvement to my Quad 66 pre amp. The noise floor is significantly reduced. The sound staging has more three dimensional depth. The bass is much improved. Stereo separation is more pronounced after you modified one of the connections to allow me to properly bi amplify to my Quad 606 power amps. Voices sound clearer. It's like a new piece of kit, thank you! I will happily recommend your excellent service. Thank you for breathing new life into my vintage equipment. I've built my set up over many years and as I'm writing this email I am listening to some Hi Res music streaming from my NAS. It is sounding sublime! I cannot wait to see the improvement when you upgrade my 606 power amps. I'm saving up now!

Wow, stunning. In fact in 25 years listening to many systems, some high end costing more than my house! I've heard nothing like this and its not ran in even a quarter! Wide open sound stage, very black, open separation, solid bass and depth with true body to it. Detailed information very revealing.Treble, head room, dynamics with fine timbre�from voice and strings and piano. Hands in the air brass is spellbinding. Stereo image is perfect and with good recording 3d! its a completely different machine with the finesse of something many, many thousands of pounds more. Hearing is believing

Hi Lee, Just to let you know that the repairs to the Marantz CD94 are working fine and the Quintessence +5v Regulator upgrade has made an amazing difference. There is much more detail and it is far more open now. It seems to have brought out the best in the various previous "upgrades" you have done for me :-) First chance I get I will let you have my Amplifier to go through as you suggested...! All the very best Steve

The 909 has been absolutely hammered since you upgraded it and I've had the opportunity to compare it with the newer Quad QSP power amp. You won't be surprised to hear that the upgrade has won hands down. Bass is better, more musical openness, it's noticeably louder(?) and I don't think the upgrade has run in yet. So despite the long wait, I'm very pleased with the upgrade and have sold the QSP. So thanks for your service from a very happy customer

I'm sure I would have had to spend many thousands of pounds to get a similar level of detail and precision if I was starting to build a system from scratch, instead you've breathed new life into my old equipment at a fraction of the cost. Really pleased with the outcome and I'm looking forward to more listening as the new electronics run in and hopefully improve the sound even further. Superb service and communication throughout and I have no hesitation in recommending your services to anyone who may be looking to upgrade their vintage kit.

Ware sehr gut, Kommunikation schwierig

Amazing upgrade - very easy to install even for a layman like myself. The communication with the seller was fantastic, and the speed at which the part was shipped was incredible - I basically had it the next day! Would definitely recommend!