Sporadic wrote:Just an update - the Martin Bastin wave mechanic will not work as it outputs just a regular mains voltage level, rather than the 19V or so that the papst needs..
So it is really down to a custom AC PSU costing maybe 500 GBP, or a new DC motor and HR psu, costing circa 500 GBP..
So is there much in it?
Not sure exactly how this would work for you as we are 120V 60hz in Canada vs. 220/50 in the UAE but here goes.
I was in the same boat as you and struggled with shelling out significant money for either a used QC Supply or spending even more on a new DC motor and power supply.
I was reading a post in the Vinyl Asylum by Harry Weisfeld from VPI on the benefits of running the Papst AC motor (he has an older Empire) off a variac and reducing the voltage following startup. This is actually one of the major things that the VPI SDS does as well.
In any event, I purchased an inexpensive variable voltage regulator to give it a try. The Gyrodec simply plugs into the variac. I turn the table on at full power (120V) and once it is up to speed I dial the voltage down to 60V. The turntable is speed consistent at 60V and there are definite sonic improvements. Hard to describe but definitely a lower noise floor-a smoother, less distorted and less grainy presentation overall. I was quite surprised. As you reduce the voltage you can actually feel the vibration decreasing on the motor housing of the Gyro and hear less motor noise. The effects of those reductions in noise and vibration are audible.
Drawbacks of this are its "manual" nature, unlike expensive power supplies like the SDS, Linn Lingo and Naim Armageddon which drop the voltage automatically following startup. With the variac you need to drop the voltage yourself and then turn it back up following shutoff (or before if you prefer) so that you'll be able to start the table up again. If you make an attempt to start the table with the voltage reduced, it will not start.
In any event, a very effective and inexpensive tweak. About $50. I've linked to the unit I purchased (the least expensive model at the top of the page). Definitely worthwhile IMO. Probably not as effective as a very expensive power supply but the laws of diminishing returns are probably at work with those and/or the DC motor and upgraded supplies for it. I have no desire to spend any more money until the AC motor completely dies.http://www.kelinginc.net/VariableACOutputTransformer.html