? $100? get a Greenlee non contact voltage detector $18 from Amazon
http://www.amazon.com/Greenlee-GT-16-Adjustable-Non-Contact-Detector/dp/B001QIJOW0/ref=pd_sbs_indust_1
I use one, and it is better than most oter models of the sort of device.
Sniff out radiated rfi. and find out what actually blocks it!
I like black antistatic foam. (has to be grounded to really work well). I use it in DACs, and around Power supply umbilicals on my preamps.
I also use quartz crystals to block EMI
http://www.amazon.com/Greenlee-GT-16-Adjustable-Non-Contact-Detector/dp/B001QIJOW0/ref=pd_sbs_indust_1
I use one, and it is better than most oter models of the sort of device.
Sniff out radiated rfi. and find out what actually blocks it!
I like black antistatic foam. (has to be grounded to really work well). I use it in DACs, and around Power supply umbilicals on my preamps.
I also use quartz crystals to block EMI