My Ceriatone 50 watt plexi kit came with 600v can caps (32+32uf and 32+16uf), but I'm replacing them with 50+50 uf ones to try to get rid of this damn buzzy horrible sounding distortion that I haven't been able to track down for 9 months (see https://www.tdpri.com/threads/how-t...-down-weird-overtones-in-plexi-build.1025094/ and https://www.tdpri.com/threads/not-sure-if-my-plexi-build-has-problems.984480/ ) However, all the can caps I'm finding (mostly F&T) are only rated for 500v, and they all say that they're good for Marshall-style circuits. Is 500v suitable, or is 600v necessary for these circuits? FWIW, the normal voltage I usually see on the plates is 410v. But I think that it's supposed to be higher when you immediately switch on the amp, right? Also, if I switch in the tube rectifier, then the voltage on the plate is usually higher, more like 430 to 440v (because I use a special power transformer that has a dedicated tube rectifier tap with higher voltage).