Update. The use of a Jensen input transformer under the brand Iso Max completely removed the buzz to a dead silence. Simply place the input transformer between the amp and preamp. Single ended preamp into the Jensen Iso Max using my RCA ic's and out from the Jensen Iso Max into my amp using xlr connectors. So the Jensen receives RCA in and xlr out. I am now able to use my amp in it's fully balanced mode.
The xlr ic's going from the Jensen to the amp must be 2 feet or under to avoid any signal deterioration.
The down side is the cost of the unit plus the cost of an extra set of ic's. Not sure as yet if then Jensen changes the sound as I am using some pro sound Mogami xlr's for now. The sound does seem a little more polite or less alive, but this my be the new set of IC's?
I will soon receive a set of xlr ic's of the same brand that I use throughout my system. I will update all as to wether the Jensen input transformer changes the sound.
The sound is very good with the inexpensive Mogami cable however. A little less top end sparkle is what I notice thus far.
I also left Jensen a message to clarify the compatability of the unit with a higher output impedance preamp. The site suggests the preamp should be no higher then 2k ohms , but other threads I have read seem to suggest this may not be the whole story.
