High B+ on Studio Pre

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RDTech

Member
Joined
Feb 23, 2023
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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?
 
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?
 
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