R RDTech Member Joined Feb 23, 2023 Messages 6 Reaction score 5 Mar 2, 2023 #1 My studio preamp just started sounding weird, opened it up to chop stick it and the board was super microphonic, took out the tubes and checked the plates. Over 500v!!!! Anyone else had something similar happen?
My studio preamp just started sounding weird, opened it up to chop stick it and the board was super microphonic, took out the tubes and checked the plates. Over 500v!!!! Anyone else had something similar happen?
D dtrax Well-known member Joined Feb 26, 2008 Messages 93 Reaction score 6 Location West Chester, PA Apr 14, 2023 #2 Without tubes the supply rail isn't loaded down. 500V sounds normal. I realize this post is over a month old, but did you roll tubes to rule out a bad one?
Without tubes the supply rail isn't loaded down. 500V sounds normal. I realize this post is over a month old, but did you roll tubes to rule out a bad one?
R RDTech Member Joined Feb 23, 2023 Messages 6 Reaction score 5 Apr 14, 2023 #3 Yeah, I found a bad cathode bypass cap
