Considering selling my restored Garrard 301

I Know the owner of Long Dog Audio and was demo’d a pre-production quartz power supply on a Garrard 401, it got a Hand Clap from the attendees, the impression it made was quite something, especially as prior to adding the LDA, the TT was being supplied Power through a Multi £000? Mains Conditioner Unit.

I was also loaned a Production LDA Quartz Power Supply, to use as a Comparison to a Power Supply/Speed Controller I Use that was built by its designer.

The LDA was the most attractive on my system.

The LDA was also used in another system with my own SC and another SC Design produced by the system owner for a 401 and Lenco.

The Lenco GL75 TT, has its own Bespoke Plinth Design and was the used TT, the LDA was preferred by myself and the system owner on this occasion as well.

Note: A DD TT with a built in Speed Control design will offer all that a ID TT can offer when it comes to having the Speed Control utilised as an extra.

The DD TT in many cases can be acquired for the cost of a ID's add on SC. 

What's a "quartz" power supply, especially as it might apply to a Garrard 301/401?  Quartz crystal oscillates at a constant very high frequency and is used as a reference to regulate speed typically of DD turntable motors. Any decent DD TT made since the late 70s uses a quartz reference and a DC motor. I'm just not aware of how a quartz reference would be used in a basic PS for an induction motor.

I can only vouch for my experiencing the LDA Quartz Power Supply and how it made a impression in the two different guises of the build I was able to encounter and have demo's off.

As for the Electronics and their Value, I can only vouch for the sonic changes encountered, as for this, the design is without doubt, using my well documented recollections and assessment, making it known the LDA has been out in front of other Power Supplies experienced in use on Idler Drives.

Is the Roadrunner compatible with the AF power supply?

It is not an Artisan Fidelity PS, it is an LDA (as specified) that AF happens to sell. I have no doubt you mean "does it work with the PS the same way it worked with Phoenix Engineering’s PS?" and the answer to that is "no". It will not automatically monitor and adjust the speed. But it does stabilize the speed such that after a brief warm up I rarely need to adjust it.

The primary benefit, as described by Artisan Fidelity, it NOT to offer speed control but to instead smooth the running of the very powerful but prone-to-noise induction motor. 

fsonic, My question was prompted by your statement, "...and the Eclipse Roadrunner now sold by SOTA to monitor speed which can then be adjusted with the power supply."

I now see that you meant speed can be manually adjusted, if the Roadrunner tach shows it to be off. I originally took your statement to mean that the RR can feed back to the Artisan Fidelity supply, as it does feed back to the Phoenix Eng supply for automatic speed adjustment. I briefly owned a Mark Kelly tube-based PS for Garrard 301/401 motors. After waiting for years for Mark to finish the build, I sold it soon after taking delivery, because I realized I was not going to move forward with a Garrard 301 project. That was one of the fastest and easiest sales of audio gear, ever. It was snatched up. I am sure those units are superb.

I now see that a "Quartz LDA" is a linear power supply for Garrard induction motors, supplied by Artisan Fidelity, and that the quartz reference is to stabilize its 50Hz output frequency.  Pretty cool. AF are a pretty smart bunch of guys with their choice of products and marketing.