Zesto vs K & K phono stages


I wanted to see if anyone has had the opportunity to listen to both the Zesto and the K & K Maxxed-Out phono stages, and if so, what your impression was if these two phono stages
franklin

Showing 3 responses by john_tracy

Vortrex, if your K&K phono experience is circa 2011, then no, it's not the latest design. The last three years have seen more that one upgrade.
One needs to take any comparison to the K&K Audio Maxed Out with a grain of salt. The "Maxed Out" has undergone several major (sonically) revisions in the last couple of years. If the person does not specify which version he/she is referring to then it may be that they heard an older incarnation and not the current offering. I can think of three major changes in the last couple of years. The addition of a CCS plate load to the input tube with the switch from series RIAA resistance to shunt resistance, greatly increasing the dynamic expressiveness. The switch from a JFET to a MOSFET in the JFET/vacuum tube cascode in the input stage, which made for a much more natural musical presentation. And finally the addition of current source fed discrete shunt regulators in the B+ supply which really enhanced jump factor and musical flow. One of the nice features of owning a K&K Audio product is looking forward to the improvements that Kevin continues to make. Improvements that Kevin won't charge an arm and a leg for like some companies. He prices his upgrades on the actual parts cost, not on the sonic benefits.
David, although not all the upgrades in the current Maxed Out are officially supported for older units it is possible to do (with cavets). I was the owner of the very first complete phono pre kit sold. When I acquired a beta Venice I sold "Old #1" to a buddy and have kept him up with all the latest upgrades including a current source fed, shunt regulated B+ supply (this was an alpha test of the idea). I was floored by that change. So was Kevin. He felt, quite rightly, that this would be too difficult to migrate backwards to all previous K&K phono pre's. That said: if you happen to have one of the older units with separate L/R Chn. boards and separate PS board; there is room to do this. The maxed out with the PS and L/R channels all on one board just do not have the room. As for bettering the Maxed Out, unfortunately the Sonus Veritas Venice, Kevin's all out 3 stage fully differential, series feed, transformer coupled, $25K phono stage never really had a chance to be heard by very many vinyl fans which is too bad.
http://www.analogplanet.com/content/my-beta-venice-phono-pre
This is a photo of my beta Venice taken before adding a CCS fed shunt reg. to the input stage.