Thank you all for the feedback. EBtech works for my other amp (a custom made integrated tube) but not perfect with this Passlabs X150 (still have a very low audiable noice). The other equipments are Passlabs X2.5 preamp and an Audio Technica turntable with build in phono amp, speakers are B&W 805, interconnects are Kimber Kable Silver Steak RCA and KCAG XLR, speaker cable is Kimber Kable 8TC; amp power cords were Cardas now replaced by Pangea (kept the ground pin to preamp) and Audio Prism power foundation. Yeah, there is really no difference removing the ground pin or using a cheater plug, it’s an ego thing:-). I used to use Proceed processor and Passlabs X250+X3 for B&W 802, 805 and HTM1, same hum, and started using cheater plugs for many years (followed Passlabs supoport advice, didn’t check all the equipments).
My tube amp is only connected to an Audioengine B1 Bluetooth adapter and B&W CM1 for bed time listening from iPad; Cardas power cord, no hum with EBtech.
There are only two other powered equipments so it would be easy to check if any one or both of them contributing to the hum.
Appreciate all your inputs and help.
Regards
PS: has anybody connected powered subwoofer to your 2 channel system? I have a B&W PV1D active subwoofer sitting there doing nothing. I sold all the multi-channel gears a few years ago, returned to near field 2 channel but kept this brand new subwoofer thinking maybe I will miss the low end base from the 802 I sold and use it to augment the 805. I recently started to listening more classic rock and was wondering how it would sound if I added that subwoofer.
