Stehno is absolutely correct in his description of how AC works, but before investing in much of anything else, i would try using some type of parallel line filters at each of the outlets that feed the amps. This should shunt most of the high frequency noise that is riding on the AC line that might get past the toroidal transformer in the JC-1's themselves. It will also do this without playing any type of games with current limiting. This is a very important factor when dealing with high powered high bias amps. You also won't have to deal with any extra connections between the amp & AC system, so the installation remains just as clean as it is now. It also keeps costs down by not requiring yet even more "fancy" power cords to feed the AC filters themselves. As such, it would be the most cost effective way to see if there would be any benefits to increased power line conditioning in your specific installation.
Having said that, anything that you can buy or put into another chassis i.e. a power line filter, can be put into the existing circuitry of an amp. The only reason that this would not be possible would be limitations in physical space. Sean
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PS... When installing parallel line filters, the effects should be relatively immediate. Having said that, it might take you a day or two to really notice their subtle but real effects on the system. As discussed in another recent thread, don't mistake high frequency artifacts ( ringing ) as "increased detail". Things might not sound quite as open or airy due to the reduction in high frequency artifacts and treble smear, but your sense of inner resolution and micro-detail will improve due to the reduction within the noise floor. The mild change in tonal balance may take a bit to get used to, but you would be stepping in the right direction.
