Thanks for feedback. My amps are consuming 300 W each. Connected a few days ago one amp to each power outlet bank. Hum level mid 30 dB. Then I added CD/SACD/DAC, Preamp and turntable. Hum went up to 50 dB in one channel. The channel with only one amp plug. Nothing else. Guessing interference between the banks. 50 dB is too high!
Viewed Audio Science Review looking inside well designed amplifier. Looks like manufacturers spend a lot of time to get it right. I just need to get the clean power to the device.
After the test with P1000 went back to Monster Power HTS2500 Reference Power Center. No hum - what so ever. Maybe my issue is just power surge protection. I have dedicated line from panel to outlet. Outlet is PS Audio.
My P1000 and the Monster Power Center are about 15 years old.
My conclusion. Don't take risk with old power equipment, Instead buy two Tripp Lite Isobar Ultra 4-Outlet Surge Protectors, Use one for the power amps. One for turntable, cd/dvd etc. and pre-amp. Excellent surge protection. Equipment insurance for power surge for $ 25,000. Less than $ 200. Thanks for comments and guidance
