Reply To: Universal PreAmp grounding of signal circuits

[Dinx]

Final update. I just finished building a class D power amplifier and decided that I would try the universal preamp that continues to hum with the Wilsenton R8. (R8 is fine as is…) Guess what… completely silent! Sounds quite incredible actually. Interestingly, I built your preamp with the remote controlled volume as you show in your latest update, except that I replaced the motorized pot with a genuine Alps unit. (Measures much better with both sides being even resistance wise). I use a 9 volt battery to power it up. Works just fine. Looks like my problem from the start was the incompatibility of the pre-in on the Wilsenton R8, not the quality of my build, parts used nor your design. Thanks to you both. PS: lots of ´stuff’ on the internet about the R8. Mine has been working for 3 years with no problems at all. Sounds great with Totem Bison Twin Towers I just purchased. Bye for now…