Pair of mono blocks modded by me with: Elna Silmic caps replaced all internal main board one's. Burr brown OPA 627 op amps these can easly be swapped too cos I used a surface mount socket so you could plug and play with others out there. Mithril pure silver wire direct from circuitboard to the Eichmann Bayonet binding posts. An already good amp design taken to another level with the mod's done. These have both balanced XLR and single ended RCA input's. £750 deliverd Iv got my eye on somthing more powerfull See: [URL]http://www.williamshart.com/jlhampli.htm[/URL]