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"For regenerators, I prefer the older versions of the PS Audio units.  Because I recommend these for source components only, the P-300 and P-500 will have adequate output for solid state source components.  Rick Cullen can do mods to both these units to make them even better.  Buying a used one and sending it to Rick is a great way to go (he can make sure it is working properly, as well as do the mods as he was the builder for all of these units).  I have not used them, but the Accuphase units look like they might be very good as well (but quite spendy, and they are not quite full regenerators as I understand them).  The new PS units (Power Plant Premier) are also good for those who need more power, but for low power sources (where I like regenerators) the old designs, while innefficient and heavy, have slightly cleaner output, and offer balanced power.  For best performance, true regenerators should be run with plenty of headroom (they are, essentially, amplifiers after all); I like loads no more than 100-130 watts on the P-300/P-500.  As regenerators are active components, they respond well to mods: capacitor upgrades, opamp upgrades, wiring and outlet upgrades can all lower their noise floor even further than stock. \nTransformer based power conditioning is offered by quite a few companies, many people report good results with some of these devices, but my personal point of view is skeptical.  Transformers add impedance to the AC line, and they add distortion, while they can filter out some noise, very good ones are heavy and very expensive.  Some people recommend isolation transformers built for industrial use (hospitals)-while these may provide AC isolation, they are not built to provide the fast, high peak, current demands of audio systems (as no one in hospitals complains about the EKG analyizer not being \"dynamic\" enough!).  One company claims that their transformer based AC products store energy to respond to dynamics, while in theory this is true, the stored energy in the magnetic field of a transformer is minimal-perhaps a 600 pound monster could store enough energy to not hamper dynamics, but I would not want to be around the EM field produced by something like this.  For power amps, I prefer parallel style filters, as they do not mess with current delivery, and some of them even offer a little bit of power factor correction.  While it is true that parallel filters do not reduce the noise level as much as series filters (or perhaps some transformer based designs) they do not pose dynamic restrictions.  I build my own, but I also like the Audience products for one, and I am never sure exactly what is in Jack Bybees products, but I have heard very good sounding systems using them.  Even though the Bybee stuff seems kooky, it is not.  I have a great deal of respect for Jack, and use some of his Bybee filters in my system to great effect.  It appears that Alan Maher's designs are parallel filter circuits as well, I think they would be worth experimenting with also. \nMost important though, is to experiment in your system, and only take my advice as a starting point. \n  \n  \n"
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