Also, try to float the AC ground on the LS25 temporarily. See if the hum/noise go away.
The guy you need to talk to at ARC is Chris Ossana. Helpful and technical Guru.
I have a pair of Classic 120's and Ref3 LE both with many upgraded parts in the critical signal path and power supplies. When the amps are on and the Ref3 is off, there is absolutely no noise or hum coming out of the speakers.
When the Ref3 is turned on and i select any source (except phono) with no signal and turned the volume to the max, there is only a very faith hiss that i hear when i put my ears to the speakers. Selecting the phono input while the phono stage is turned on with no signal, i can hear hiss or what they call "tube rush". However, that is to be expected from tube phono stage. Mine is a Ref2 Phono.
Tube amplification nowadays CAN BE quiet although no quite to the level of a good solid state design.
Good Luck.
The guy you need to talk to at ARC is Chris Ossana. Helpful and technical Guru.
I have a pair of Classic 120's and Ref3 LE both with many upgraded parts in the critical signal path and power supplies. When the amps are on and the Ref3 is off, there is absolutely no noise or hum coming out of the speakers.
When the Ref3 is turned on and i select any source (except phono) with no signal and turned the volume to the max, there is only a very faith hiss that i hear when i put my ears to the speakers. Selecting the phono input while the phono stage is turned on with no signal, i can hear hiss or what they call "tube rush". However, that is to be expected from tube phono stage. Mine is a Ref2 Phono.
Tube amplification nowadays CAN BE quiet although no quite to the level of a good solid state design.
Good Luck.