Many "conditioners" have the problem of using transformers in an attempt to isolate the wall outlets from the ones on the unit. The transformers end up limiting available current, and can cause trouble for amps.
+1
Monster/Furman/APC/Belkin conditioners primarily employ internal transformers and chokes to assist with provision of "clean power". Electrical current can be "held back" when filtering with transformers & chokes.
Even if you have tried/auditioned conditioners from various manufacturers listed above, you are not straying from the transformer/choke design philosophy.
