Originally Posted by TimboMc
Thanks for the replies. The same applies to a champ without the ground switch I assume. I have a Big Blue .047 Cap on the side of the fuse that goes to ground. I should remove this and complete the uncle spot mod?
It only applies to amps with a ground switch, particularly 2wire amps.
A three wire power cord amp with ground switch will blow the outlet's fuse/breaker (hopefully) if you go hot to chassis/ground, but with building wiring as it is, thats not guaranteed. Neither is it guaranteed if you defeat the 3wire with an adapter and dont ground the pigtail wire.
HOWEVER - the chances of shorting that cap are pretty damn small. I mean really small. Can it happen? Well probably. Has it happened, can't say that I've never heard of one documented case, only anecdotal stories.
I mean consider this - if your preamps 12AX7 shorts plate to grid, your guitar is gonna have +200vDC on it. And let me tell you folks, tubes short WAY more often than capacitors (which usually go open). Do you hear about that problem happening? No. Also capacitors will almost never go short all at once. And, capacitors pass AC (which your wall has) and block DC, so in a way you're getting that chassis potentially revved up a bit anyway even when its working fine, and people are just not dropping dead all over the place from it.
Don't lose sleep over the "death cap". Its an issue folks have picked up on that is really not a big deal. If you want to though, put a 630v Orange Drop in there, and you can think on it lasting another 30 years with no issues.